CUT fresh strawberries into quarters; MASH; ADD water (If using FROZEN strawberries, see note).
In a large mixing bowl, COMBINE cake mix and gelatin powder; ADD oil, eggs and strawberries; BEAT for 2 minutes.
POUR mixture into a 9"x13" greased and floured cake pan.
BAKE at 350° until a toothpick inserted in center comes out clean, about 35 minutes.
REMOVE from oven; let COOL on rack
CUT fresh strawberries into quarters; MASH (if using FROZEN strawberries, see note)
In a medium mixing bowl, MIX butter and sugar until smooth; STIR in mashed strawberries.
SPREAD icing between cooled cake layers; FROST top and sides.
May substitute a box of FROZEN strawberries if FRESH strawberries are not available SUBSTITUTE step 1: THAW strawberries; MASH; DRAIN off approximately 1/4 cup juice and RESERVE. DELETE step 6; use reserved juice in step 7.
Per Serving (excluding unknown items): 1087 Calories; 31g Fat (25.1% calories from fat); 5g Protein; 203g Carbohydrate; 1g Dietary Fiber; 91mg Cholesterol; 355mg Sodium. Exchanges: 1/2 Lean Meat; 0 Fruit; 6 Fat; 13 1/2 Other Carbohydrates.