Sima (Finnish Lemon May Day Drink)
Why this recipe works
- Gentle fermentation: A small amount of yeast gives the drink its delicate sparkle without turning it into a heavy or strongly fermented drink.
- Bright citrus balance: Lemon zest and juice bring freshness that keeps the sweet syrup lively rather than cloying.
- Prepared in advance: The fermentation and chilling time happen mostly unattended, making it a practical drink to prepare before serving.
Get the most out of this recipe
Timing notes
- Allow time to ferment: The drink usually needs 12 to 24 hours at cool room temperature before it develops a faint fizz.
- Chill before serving: Cold storage slows the fermentation and gives sima its most refreshing texture and flavour.
- Best within a few days: Drink it within 3 days for the freshest lemon flavour and a gentle sparkle.
Authenticity notes
- Vappu drink: Sima is closely associated with Finnish May Day celebrations and is commonly served as a festive spring drink.
- Light fermentation: The characteristic fizz comes from a short yeast fermentation rather than carbonation added later.
- Raisin indicator: Raisins are often added near the end; when some float to the surface, the drink is typically ready to chill and serve.
Ingredient notes
- Use unwaxed lemons if possible: Because the zest is steeped directly in the syrup, unwaxed lemons give a cleaner citrus flavour.
- Avoid the bitter pith: Peel the zest in wide strips and leave behind as much white pith as possible to keep the drink bright rather than bitter.
- Adjust the sugar character: More caster sugar gives a lighter flavour, while more dark brown sugar adds a deeper, caramel-like note.
Common mistakes
- Adding yeast too soon: Let the lemon syrup cool to lukewarm before adding the yeast, as hot liquid can stop the fermentation from working.
- Fermenting for too long: Once the flavour is lightly fermented and gently fizzy, move the drink to the fridge to slow the fermentation.
- Leaving it unrefrigerated: After the first ferment, keep sima chilled in a covered jug and stir before serving if any yeast has settled.
Equipment you'll need
Ingredients
Instructions
- Pour the water into a large pot and bring it just to a simmer, then take it off the heat. Stir in the caster sugar and dark brown sugar until fully dissolved.
- Using a vegetable peeler, remove the zest from the lemons in wide strips, avoiding the white pith, then add the zest to the hot syrup. Halve the lemons and squeeze in the juice, then leave to steep until the liquid is lukewarm.
- Strain the liquid into a clean mixing bowl, pressing the zest lightly, then discard the zest. Sprinkle over the active dry yeast and stir well to combine.
- Cover and leave at cool room temperature until you see gentle bubbling and a faint fizz when stirred. This usually takes 12 to 24 hours depending on room temperature.
- Stir in the raisins, then cover and chill until cold and lightly sparkling. The drink is ready when a few raisins float to the surface and the flavour is lightly fermented.
- Stir once, then pour into glasses, making sure each glass gets a few raisins. Serve well chilled.
Recipe notes
Tips
- Keep the liquid lukewarm before adding the active dry yeast; if it is hot, the yeast will not work properly.
- For a gentler ferment, leave it at the cooler end of room temperature and taste after 12 hours, then chill as soon as it suits you.
- If you are pregnant, immunocompromised, or serving children, avoid lightly fermented drinks and make a fresh lemon drink instead.
Substitutions
- Replace dark brown sugar with caster sugar for a cleaner, lighter flavour.
- Replace caster sugar with dark brown sugar for a deeper, more caramel-like note.
Storage
- Refrigerate up to 3 days
- Store sima in the fridge in a covered jug and drink within 3 days for the best flavour and gentle fizz. Stir before serving as the yeast can settle.
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Recipe overview
- Servings: 4 glasses
- Total time: 48h (25min active)
- Difficulty: Medium
- Cuisine: Nordic
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