Grilled Cheese, better than usual

I just love grilled cheese an here is an elevated version of it.

Grilled Cheese
Serves 4

4 anaheim peppers
1/4 cup of white vinegar
1/2 cup of red onion, thinly sliced
1/4 cup of dijon mustard
1/4 cup of mayonnaise
8 slices of rye bread
12 slices of provolone cheese
2 ripe tomatoes, thickly sliced
8 slices of cheddar cheese
1/2 cup of butter, softened

Roast the chiles, until the skin is blackened. When they are charred, put them in a bowl, cover them with plastic wrap and let them steam for a while.
Next, pour the vinegar over the sliced red onion, and let them sit awhile.
Make the special sauce, equal amounts of dijon mustard, and the mayonnaise.
Scrape out the seeds and scrape the blackened skin of of it.
Spread the bread with the mustard sauce, layer it with 2 slices of provolone, 2 slices of tomato, 2 slices of cheddar, a layer of roasted chiles, slices of red onion, and one more slice of provolone.
Top with the other slice of bread, and spread with butter.
Toast the sandwiches in a skillet until golden brown.
Yum!

Serve with a caesar salad