In a blender, add 100 grams of mixed berries (strawberries, blueberries, raspberries), 2 tablespoons of sugar, and 1 cup of crushed ice. Blend until smooth.
Pour the blended mixture into a glass.
Top it up with 200 ml of soda water and stir gently.
Garnish with a few fresh berries and a slice of lemon.