Streusel Ginger Cake
["2 1/4 c. sifted enriched flour", "1 c. sugar", "1 tsp. ginger", "1 tsp. cinnamon", "1/2 c. soft shortening", "1 egg", "1/4 c. sour milk", "1 tsp. soda", "1/4 tsp. salt", "1/4 c. molasses"]
["Heat oven to 350\u00b0.", "Grease well and dust with flour a square pan (9 x 9 x 1 3/4-inch)."]
["flour", "sugar", "ginger", "cinnamon", "shortening", "egg", "sour milk", "soda", "salt", "molasses"]