Yuma Dip Sandwiches

Ingredients (9)

• + 3 pounds top round roast add to pantry
• + 1 (16 ounce) bottle Italian-style salad dressing add to pantry
• + 1 onion, thinly sliced add to pantry
• + 8 ounces fresh mushrooms, sliced add to pantry
• + 4 tablespoons butter add to pantry
• + 2 (1 pound) loaves French bread add to pantry
• + 1 pound processed cheese food (eg. Velveeta), cubed add to pantry
• ✓ 1 cup salsa
• + ¼ cup chopped jalapeno stuffed green olives add to pantry