3 lb. very ripe plums, pitted and quartered
1 1/2 c. brown sugar
6 tbsp. cassis liqueur
1 c. flour
3/4 c. oats
1/2 c. walnuts
1 tbsp. cinnamon
3/4 c. butter (1 1/2 sticks)
1 lg. egg

Preheat oven to 375 degrees. Combine plums, 1/2 cup sugar and liqueur; turn into 12 x 8 baking dish. Combine flour, oats, walnuts, 1 cup sugar, cinnamon, salt in bowl. Cut in the butter until mixture looks like coarse meal. Add egg and mix until moist and crumbly.

Sprinkle topping over plums. Bake until browned and bubbly, 40-45 minutes. Serve warm or at room temperature with ice cream.