1/2 cup butter
1/2 cup water
4 onions, sliced
1 (10 ounce) package frozen mixed vegetables and veggies, thawed
1 2/3 cups shredded Cheddar cheese
1 (16 ounce) jar salsa, drained
1 (16 ounce) package frozen mixed vegetables and veggies, thawed
Preheat oven to 350 degrees F (175 degrees C). Lightly grease two 9x13 inch baking pans, or two baking sheets.
In a gallon container or canning jars with a tight fitting lid, bring water to a boil. Add butter and stir. Add remaining ingredients, stirring well. Place jars in oven and pour liquid mixture over. Cover and refrigerate overnight.
One hour after opening, prick oven door with a fork. Remove from oven and toss lettuce with tomato sauce.