INGREDIENTS
Butter for greasing pan
For the rhubarb filling:
1/2 lb
rhubarb, trimmed
1/4 cup
sugar
2 tsp
cornstarch
1/2 tsp
ground ginger
For the crumbs:
1/3 cup
dark brown sugar
1/3 cup
granulated sugar
1 tsp
ground cinnamon
1/2 tsp
ground ginger
1/8 tsp
salt
1/2 cup
or 4 ounces) butter, melted
1 3/4 cups
all-purpose flour
For the cake:
1/3 cup
sour cream
1
large egg
1
large egg yolk
2 tsp
vanilla extract
1 cup
cake flour (ditto on the all-purpose flour–worked just fine)
1/2 cup
sugar
1/2 tsp
baking soda
1/2 tsp
baking powder
1/4 tsp
salt
6 tbsp
softened butter, cut into 8 pieces.