It's very common to prepare kissel from instant mixes but I prefer the traditional way.
400g strawberries, chopped
3 cups cold water
1 teaspoon vanilla powder
2-3 tablespoons sugar
2-3 tablespoons potato flour
1. Place the strawberries, vanilla, and sugar in a pot and pour in 2,5 cup water. Bring to the boil and cook for 2 minutes.
2. Combine the remaining water with potato flour. Mix with the strawberries and stir. Bring to the boil. Cook for about 10 minutes over low heat.
3. Put the kissel aside and wait until it cools down. If it's not thick enough, add a little bit of potato flour mixed with cold water and bring to the boil again.
4. Serve warm or cold.