portabella sandwich

• 1 portabella mushroom, stem and gills removed
• marinating sauce: olive oil, minced garlic, diced onions, salt & pepper. spread inside the cap (one hour should be enough, but i let it stand overnight)
• 2 slices of toast
• lettuce
• swiss cheese
• tomatoes
• red onions
• mayonnaise 
• black pepper
• + a stack of napkins because damn portabella is juicy