In a saucepan over low/medium heat combine 2 cups of blackberries, sugar, lemon juice and 3 tablespoons of water and bring to a boil.

Simmer for 5 mins, then add remaining 1 cup of blackberries. Stir.

In seprete bowl make thickener with 4 tbsp of water and arrowroot flour together and whisk until completely incorporated.

Add thickener to simmering fruit topping

Continue cooking until sauce thickens, about 3-4 minutes.

Remove from heat and either serve warm over pancakes or waffles or cool to use for cheesecake, yogurt or ice cream