Grilled Cheese with Avocado and Tomato

large avocado

salt and pepper

softened butter

slices of bread (sourdough, multigrain, white-your choice-)

ripe tomatoes, thinly sliced with seeds removed (Removing the seedy parts will keep the tomato from getting to watery)

slices cheese (Provolone, havarti, white cheddar- your choice)