Portabella in Burgers

• 1 large portabella mushroom (or 2 medium)
• 1 tablespoon margarine
• 1 lb lean ground beef
• 12 cup grated Fontina cheese (or more) or 12 cup asiago cheese (or more)
• 1 tablespoon fresh rosemary, finely chopped
• salt and pepper

1. Chop stem and cap of mushroom into 1/4 inch pieces, about 1 1/2 cups chopped.
2. Melt margarine in skillet over medium high heat.
3. Add mushrooms and stir fry 2 to 3 minutes.
4. Cool mushrooms in large bowl.
5. Crumble beef over mushrooms.
6. Add cheese, rosemary, salt and pepper.
7. Mix thouroughly.
8. Shape into 4 large burgers, about 3/4 inch thick.
9. Grill on pre heated BBQ at least 5 to 6 minutes per side.

portabella mushroom, margarine, lean ground beef, cheese, fresh rosemary, salt

Taken from www.food.com/recipe/portabella-in-burgers-91546 (may not work)