Added sliced Provolone, which I melted over the top under the broiler and made the sandwiches in pita pockets. Delicious!
salt and black pepper
or thick crusty brown bread
Preheat a grill.
Season onions with salt and pepper and brush with oil. In a small saucepan combine beer and mustard and bring to a boil.
Add pastrami and simmer for 3 minutes.
Grill onions on both sides and toast bread on a cooler part of the grill.
When all ingredients are heated, prepare sandwich.