Pebbles Portabello Mushroom Sandwich

Source: Thought You`d Never Ask - Dorothy Chapman - March 8, 2001

Marinade of balsamic vinegar and oil
4 ounces portobello mushroom
1 ounce unsalted butter
1/4 ounce red bell pepper, diced
1/4 ounce minced garlic
2 ounces julienned yellow onion
2 slices Monterey jack cheese
7-inch French baguette, sliced
1/4 ounce Balsamic vinegar
1/4 ounce fresh spinach
1 plum tomato, diced
Dash of salt and pepper

Marinate the portobello in the vinegar and olive oil mixture for 1 hour.

Slice into 5 to 6 pieces.

In a saut