Russia desserts - I know we're out of order!

The Russian dessert was a bit of an amalgamation of several recipes, according to K&V. Here is the amalgamation:

RUM AND BUTTER SAUCE 
1/4 c. butter
1 c. brown sugar
3 tbsp. cornstarch
2 c. water
1 tbsp. lemon juice
2 tbsp. vanilla
Rum or rum extract, to taste
Bring butter and sugar to a boil. Mix cornstarch with water; stir into butter and sugar mixture. Boil and stir until thickened. Add lemon juice, vanilla and rum or rum extract.

and.....
RUSSIAN COFFEE CAKE 
1/2 c. butter
1 c. white sugar
2 eggs
2 c. flour (not sifted)
1 tsp. baking powder
1 tsp. baking soda
1/2 tsp. salt
1/2 pt. sour cream

MIXTURE
1/2 c. brown sugar
1 tsp. cinnamon
2 tsp. flour
2 tsp. butter
1/2 c. walnuts

Mix first 8 ingredients together then alternate flour and sour cream mixture with second 5 ingredients with walnut mixture on top. Bake in tube pan 9 inch and bake at 350 degrees for 40 minutes. Grease pan and flour.
Both recipes from: www.cooks.com