Combine raspberries, sugar, and water in a saucepan. Mix well to ensure all ingredients are combined.

Cook the mixture over medium heat, mashing the berries until the jam thickens (about 5-10 minutes).

Mix flour, vegan butter, and powdered sugar in a bowl until a dough forms.

Adjust dough consistency with water or flour as needed.

Preheat your oven to 350°F (180°C) and grease your tart tins.

Roll out the dough on a floured surface and cut into circles. Press into tart molds.

Fill each tart with jam and bake for 20 minutes until golden brown.

Cool the tarts on a wire rack before serving.