Rhubarb and Raspberry Pie With Oatmeal Crumble

INGREDIENTS

single pie crust, store bought or this is my favorite recipe

For the Crumble Topping

3/4 cup

old fashioned oats

1/2 cup

all-purpose flour

1/2 cup

packed light brown sugar

1/2 tsp

salt

1/2 tsp

cinnamon

1/4 tsp

ground ginger

6 tbsp

cold salted butter, cut into small pieces

For the Pie Filling

4 cups

rhubarb, sliced into ¼-inch pieces

3 pints

raspberries (18 ounces)

1/2 cup

packed light brown sugar

1/4 cup

granulated sugar

1/4 cup

instant tapioca

zest of 1 lime

1/2 tsp

ground cardamom