Grilled Cheeseburger with Green Chile Sauce

I have been craving hamburgers lately! And then the Food Network had a special on them so I went online and printed out some of the recipes they featured. This cheeseburger recipe came from Bobby Flay. The homemade green chile sauce is really, really, good!

Grilled Cheeseburger with Green Chile Sauce

2 lbs. ground chuck (80-85% lean)
1 tsp kosher salt
1 tsp freshly ground black pepper
8 slices provolone or monterey jack cheese
4 good quality buns (I like using homemade or ciabatta rolls)
green chile sauce (recipe follows)
Romaine lettuce
4 thick slices tomato

Heat grill to medium heat. Form meat into 4 8 oz. patties and season each burger on both sides with 1/4 tsp salt and 1/4 tsp pepper. Grill until charred on both sides and cooked to desired doneness.
Place 2 slices of cheese on each burger, at the same time cut buns in half and place cut side down on grill to toast. Close BBQ lid and grill until cheese is melted and buns are toasted, usually takes just a few minutes. Place burgers on buns and top with green chile sauce and lettuce, tomato, and mayo.

Green Chile Sauce:

1 poblano chile (they are big and green)grilled, peeled, seeded, and chopped
1/2 medium white onion, grilled and chopped
1 clove garlic, chopped
1 Tbs. fresh epazote (it's an herb) or 1 Tbs. fresh cilantro chopped
1/4 c. cold water
1/2 Tbs. honey
1/4 tsp kosher salt
1/4 tsp freshly ground black pepper

I grill my onions and pepper at the same time that I put on the burgers. I rubbed olive oil all over the pepper and onions and grilled until they had grill marks on them and were soft to the touch.

Combine all ingredients in blender, blend until smooth.