Roughly chop the Macadamia nuts. Cut the cold butter in pieces, mix with the other ingredients and kneed (with your hands or a food processor) until well combined. Form a ball and put it in the fridge.

Preheat the oven to 180 degree

Add the berries to a pan, bring to a boil. Turn down the heat, mix the starch with some liquid, e.g. the lime juice, rosé or some water and make sure it is fully dissolved. Add to the berries with the rest of the ingredients. Let simmer until it has thickened a bit (ca. 5-10 minutes)

Add the crust into a tarte pan (square or round), keeping 1/3 of the dough for the crumbles. Add the berries and crumble the rest of the dough on top. Bake for 30-35 minutes.

Serve with vegan ice cream, fresh berries or just powdered sugar.