If you’ve never heard of filmjölk before, you’re not alone, but once you try it, you’ll wonder how it wasn’t already part of your homestead kitchen routine. It’s a traditional Swedish fermented milk drink that’s been around since the Viking age, and it’s one of the easiest cultured dairy foods you can make at home. No yogurt maker, no fancy equipment, and no heating your house to 110 degrees. Just milk, a starter culture, and a little patience.
I love adding new fermented foods to our kitchen, and filmjölk has quickly become one of my favorites. It’s smooth, mildly tangy, slightly buttery, and perfectly drinkable think of it as a gentler, more pleasant cousin to kefir.
If you are making filmjolk, you might also like my from scratch recipes for:
This article is part of my homestead cooking series where I share how to make from-scratch food instead of buying it at the grocery story. From homemade bread and jelly to homemade condiments. I'm Gretchen and I've been homesteading for over 15 years. Here at the Backyard Farming Connection, I connect the lines between growing your own food, raising your own animals, and putting it all together in the kitchen.
Contents
What Exactly is Filmjölk?
Filmjölk (pronounced feel-myolk) is a fermented milk product that dates back to the Viking age in Scandinavia. The word roughly translates to “sour milk,” but don’t let that put you off it’s much more nuanced than that sounds.
It’s made by fermenting cow’s milk with a specific combination of lactic acid bacteria, including Lactococcus lactis and Leuconostoc mesenteroides. Those bacteria do two important things: they convert the lactose in milk into lactic acid (which gives it that mild tang and makes it easier to digest for lactose-sensitive folks), and they produce a small amount of diacetyl, the compound responsible for that subtle buttery flavor that makes filmjölk so uniquely delicious.
The result is a lightly thickened, drinkable yogurt with a smooth texture. It’s popular across the Nordic countries, where you’ll find it on breakfast tables served plain, with berries, honey, or granola.
How is it different from regular yogurt? Standard yogurt is thermophilic: it needs to be incubated at around 100–110°F to culture properly. Filmjölk is mesophilic, which means it cultures right at room temperature. This makes it a fantastic option if you’ve ever struggled to maintain the right temperature for a standard yogurt culture.
Why Make It at Home?
Here’s the thing filmjölk is nearly impossible to find outside of Scandinavia. If you look closely at Siggi’s drinkable yogurt at the grocery store, it actually says “Swedish Style Filmjölk” on the label. That tells you how special this stuff is. Making it at home means you control the ingredients, save money, and get a much fresher product.
It’s also one of the most forgiving fermented dairy projects you can take on. Once you have a good culture going, you just save a little from each batch to start the next one it becomes a self-sustaining system, which is exactly the kind of thing I love about homestead food production.
What You’ll Need for Homemade Filmjolk
Ingredients
- 1 quart (4 cups) whole milk — Whole milk gives the best flavor and thickest texture. Pasteurized milk works great. If you’re using raw milk from your own animals, you’ll want to scald it first (more on that below).
- ¼ cup filmjölk starter culture — Either a freeze-dried heirloom starter or a small amount saved from a previous batch. You only need to purchase this once as you can use the culture from your homemade filmjolk in the future.
That’s it. Two ingredients.
Equipment
- A clean quart-sized glass jar with a tight-fitting lid
- A thermometer (helpful but not strictly required)
- A small saucepan
Where to Get a Filmjölk Starter
This is the one step that requires a little planning, but it’s easy once you know where to look.
Buy a freeze-dried culture online. A single packet will get you started, and then you just save a bit from each finished batch to culture the next one — indefinitely.
Use a store-bought filmjölk. If you can find Siggi’s Swedish Style Drinkable Yogurt at your local grocery store, you can use that as your starter. Just use ¼ cup per quart of milk.
Get some from a friend. Once someone in your community has a good culture going, sharing is easy and free. Check homesteading groups in your area.
How to Make Homemade Filmjölk: Step-by-Step
Step 1: Heat Your Milk
Pour your milk into a small saucepan and heat it over medium heat until it reaches about 180°F you’ll see small bubbles forming around the edges and steam rising. This step isn’t strictly required if you’re using pasteurized milk, but it’s worth doing. Heating helps reorganize the milk proteins so the final product thickens more reliably, and it also eliminates any competing microbes that might affect flavor or texture.
* I only heat my milk if I have time – if I’m short on time I skip it and have still had the same amount of success.
Step 2: Cool to Room Temperature
Remove the pan from heat and let it cool down completely to room temperature — around 70–77°F. This is important. If the milk is too warm when you add the starter, it can kill the bacteria. You can speed this up by setting the pan in a bowl of cold water.
Step 3: Add Your Starter
Pour the cooled milk into your clean quart jar and stir in ¼ cup of your filmjölk starter. Stir gently to combine.
Step 4: Cover and Wait
Put the lid on your jar and set it somewhere at room temperature between 70–77°F is ideal. A kitchen counter usually works great in most seasons. Leave it undisturbed for 18–24 hours.
How do you know when it’s done? Tilt the jar gently. When the filmjölk pulls cleanly away from the sides of the jar as one cohesive mass, it’s ready. It should look slightly thickened and custard-like, not watery.
Step 5: Refrigerate and Enjoy
Transfer the jar to the refrigerator. It will continue to thicken slightly as it chills. Filmjölk keeps well in the fridge for up to 2 weeks.
Tips for Success for Homemade Filmjolk
Start with whole milk. The fat content makes a real difference in both flavor and texture. Skim or low-fat milk will give you a thinner, less satisfying result.
Mind your kitchen temperature. Below 65°F, fermentation will slow way down or stall. Above 80°F, fermentation speeds up but you risk a sharper, more sour flavor and a curdled texture. In summer, you might find your filmjölk is ready in closer to 18 hours. In a cool house in winter, it might take a full 24.
Be patient with a new starter. Sometimes the first batch or two from a freeze-dried culture isn’t quite as thick or tangy as it will eventually become. Give it a few batches to establish itself.
Always save your starter. Before you dig into a new batch, set aside ¼ cup in a small jar in the fridge. This is your starter for the next batch. Use it within a week for best results.
Raw milk users: Scald your milk to 180°F and cool it down before adding your starter. This ensures the native bacteria in raw milk don’t compete with your filmjölk culture.
Serving Ideas for Homemade Filmjolk
Filmjölk is incredibly versatile. In Sweden, it’s most commonly eaten at breakfast. Here are a few ways to enjoy it:
- Drink it straight from a glass, it’s perfectly drinkable on its own
- Pour it over granola or muesli for a quick, nourishing breakfast
- Top it with fresh or frozen berries, a drizzle of honey, and a sprinkle of cinnamon
- Use it in smoothies as you would kefir or yogurt
- Swap it for buttermilk in baking, it works beautifully in pancakes, muffins, and quick breads
Keeping Your Culture Going
One of the best parts of filmjölk is that it’s a perpetual culture. Once you have a batch going, you just keep re-culturing it indefinitely. Every week or so, make a new batch by using ¼ cup of the previous batch as your starter. It’s a satisfying, self-sustaining rhythm that fits right in with homestead life.
If you need to take a break from making it, the culture can be frozen. Put ¼ cup in a small freezer-safe container and freeze for up to 3 months. To wake it back up, thaw in the fridge and use it to start a fresh batch — it may take one or two batches to get back to full strength.
A Note on Lactose
Because the bacteria in filmjölk convert much of the lactose into lactic acid during fermentation, many people who are lactose-sensitive find they tolerate filmjölk better than regular milk. It’s not lactose-free, but the reduction in lactose is meaningful. If you’re sensitive, start with a small amount and see how you feel.
Final Thoughts on Homemade Filmjolk
Filmjölk is one of those homestead kitchen projects that feels like a small miracle. You pour milk into a jar, wait a day, and come back to something creamy, tangy, and delicious with minimal effort and no special equipment. It fits perfectly into the kind of simple, intentional food culture that so many of us are working toward.
If you’re already making yogurt, kefir, or other cultured dairy at home, filmjölk is a natural and easy addition to your rotation. And if you’re just getting started with fermented foods, this is honestly one of the best places to begin.
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Ingredients
Method
- Pour your milk into a small saucepan and heat it over medium heat until it reaches about 180°F you’ll see small bubbles forming around the edges and steam rising. This step isn’t strictly required if you’re using pasteurized milk, but it’s worth doing. Heating helps reorganize the milk proteins so the final product thickens more reliably, and it also eliminates any competing microbes that might affect flavor or texture.
- Remove the pan from heat and let it cool down completely to room temperature — around 70–77°F. This is important. If the milk is too warm when you add the starter, it can kill the bacteria. You can speed this up by setting the pan in a bowl of cold water.
- Pour the cooled milk into your clean quart jar and stir in ¼ cup of your filmjölk starter. Stir gently to combine.
- Put the lid on your jar and set it somewhere at room temperature between 70–77°F is ideal. A kitchen counter usually works great in most seasons. Leave it undisturbed for 18–24 hours.
- How do you know when it’s done? Tilt the jar gently. When the filmjölk pulls cleanly away from the sides of the jar as one cohesive mass, it’s ready. It should look slightly thickened and custard-like, not watery.
- Transfer the jar to the refrigerator. It will continue to thicken slightly as it chills. Filmjölk keeps well in the fridge for up to 2 weeks.
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