Mix 1 teaspoon lemon juice to 1/2 cup of milk to make sour milk; set aside for 15-20 minutes.

3 c. flour
1/4 c. cocoa
1 tsp. baking soda
1 tsp. salt
3/4 c. oil
3 eggs
1/2 c. sour milk
1/2 c. butter
1 3/4 c. sugar
1 tsp. vanilla
2 c. grated zucchini
1 c. chocolate chips
1 c. chopped walnuts

Mix ingredients together. Grease and flour pan. Sprinkle chocolate chips on top of cake. Bake at 325 degrees for 50-60 minutes, cupcakes at 325 degrees for 30-40 minutes.