Kissel (Russian Berry Kissel)

The starch is what controls the texture. As a guide, per litre of liquid: about 20 g of potato starch gives a thin, sippable drink, 45–55 g gives a medium kissel, and 75–90 g gives a firm dessert you can turn out of a mould. This recipe puts 60 g into roughly 1.15 litres, about 52 g per litre, so it comes out medium: pourable while warm and thick enough to eat with a spoon once chilled. For a firm dessert that holds its shape, use 80–90 g of starch per litre. Adjust up or down to taste, remembering that more starch also makes it taste less sweet.

Potato starch sets clear and glossy and keeps the bright ruby color of the berries, which is why it's traditional for fruit kissel. Cornstarch works but turns the mixture cloudy and slightly milky, dulling the color, so it's better kept for milk-based kissel. Potato starch also thickens at a lower temperature and gives that characteristic smooth, slightly jelly-like texture. Whichever you use, slake it in cold water first.

Lumps come from adding dry starch straight to hot liquid — always mix it into cold water first until smooth, then pour it in slowly while stirring. Too-thin kissel usually means either not enough starch or over-boiling: potato starch loses its thickening power if cooked hard for more than a couple of minutes, so stop as soon as it thickens. Stirring near the edge of the pot as you pour helps it set evenly.

Yes — kissel works with almost any tart fruit: cherries, blackcurrants, raspberries, blueberries, plums, or a mix, and also with rhubarb, dried fruit, or even jam let down with water. Frozen berries work well; thaw them first if you want to press out the raw juice in step 1. Sweeten to taste depending on the fruit's acidity. Very sweet fruit may need a squeeze of lemon to keep the bright, tangy character that defines a good kissel.

A skin forms as kissel cools; dust the surface with a thin layer of sugar or lay cling film directly on top to prevent it. Store it covered in the fridge for up to 3 days; it thickens further as it chills, so loosen a thick one with a little water or juice if needed. It's served warm, at room temperature, or cold. Thick kissel can be set in moulds and turned out like a jelly. It also goes well next to syrniki at breakfast.