In bottom of oblong dish break up 2 cups pretzels. Melt 3/4 cup butter and stir in 3 tablespoons of sugar. Pour over pretzels and bake at 400 degrees for 8 minutes.
Cool 25 minutes. Meanwhile prepare 1 large box of strawberry Jello with 2 cups of boiling water and add 2 (10 ounce) boxes of frozen strawberries, stir and let thicken in refrigerator.
Mix 1 (8 ounce) package cream cheese with 1 cup of sugar; fold in 1 (8 ounce) Cool Whip. Spread over cooled pretzel crust making sure you seal the crust. Cover with Jello mixture and refrigerate.