Blueberry Cake With Vinegar Sauce(Old New England Recipe)  
["1 3/4 c. all-purpose flour", "2 tsp. baking powder", "1/4 tsp. salt", "1/4 c. shortening", "1 c. granulated sugar", "1 egg, unbeaten", "1/2 c. milk", "1 tsp. vanilla", "1 1/4 c. fresh blueberries, coated with 4 tsp. flour"]
["Grease and flour and 8 x 8 x 2-inch pan.", "Sift first 3 ingredients together.", "With back of spoon, work shortening against sides of mixing bowl until smooth and creamy.", "Add sugar slowly, continuing to work until light.", "Add egg; beat with a spoon.", "Add flour mixture alternately with combined milk and vanilla in thirds, beating with a spoon.", "Fold in blueberries.", "Pour into pan.", "Bake at 350\u00b0 for 50 minutes."]
["flour", "baking powder", "salt", "shortening", "sugar", "egg", "milk", "vanilla", "fresh blueberries"]