Chipotle Portobello Burgers Recipe - Barbecuebible.com

Ingredients

• 3 to 4 canned chipotle chiles with adobo sauce
• 3 cloves garlic, finely minced
• 1 small onion, chopped (about 1/2 cup)
• 2 tablespoons balsamic vinegar, or more to taste
• 1/2 cup vegetable oil
• Coarse salt and freshly ground black pepper to taste
• 4 portobello mushroom caps, wiped clean with a dampened paper towel
• 1 large sweet onion, cut crosswise into slices, then skewered
• 1/2 cup salted butter, melted
• 2 poblano chiles
• 4 individual ciabatta rolls, or other rustic roll, sliced in half
• 4 slices pepper Jack cheese
• 2 ripe avocados, pitted and sliced