Green Chili Smash Black Bean Beef Burger – The Bean Institute

Ingredients

• 2 tablespoons butter
• 2 red onions (medium, thinly sliced)
• 2 tablespoons water
• as needed salt
• as needed ground black pepper
• 2 green chiles (stemmed)
• 1 cup mayonnaise
• 2 garlic cloves (pounded to a paste)
• 2 tablespoons cilantro (finely chopped)
• 1 tablespoon lime juice
• ½ pound ground beef
• 2 ounces red onions (finely diced)
• 2 garlic cloves (finely minced)
• 2 teaspoons salt
• 1 tablespoon chipotle (canned, chopped)
• 1 15- ounce can black beans (rinsed and drained)
• 6 pretzel buns (toasted)
• 6 ounces jack cheese (sliced)
• 6 lettuce leaves (frisse, or red leaves)
• avocado slices (optional)