Mystery Cake
["2 c. all-purpose flour", "1/2 tsp. salt", "1/2 tsp. cinnamon", "1/4 tsp. nutmeg", "1/4 tsp. cloves", "1 Tbsp. baking powder", "1 c. sugar", "2 eggs", "1/2 c. butter", "1 (10 1/2 oz.) can condensed tomato soup (mystery ingredient)", "1 c. chopped walnuts", "1 c. chopped raisins"]
["What gives this cake its pretty color and rich flavor?"]
["flour", "salt", "cinnamon", "nutmeg", "cloves", "baking powder", "sugar", "eggs", "butter", "tomato soup", "walnuts", "raisins"]