Red River Burger

INGREDIENTS

• 1/2 cup chopped green onions or 1/2 cup finely chopped white onion
• 2 tablespoons fine dry breadcrumbs
• 2 red serrano peppers, seeded and finely chopped
• 3 canned chipotle chiles in adobo, chopped
• 1/2 teaspoon salt
• 1 lb lean ground beef
• 4 wheat hamburger buns, split (1-inch-thick) or 8 slices bread (1-inch-thick)
• roasted red pepper catsup, roasted garlic catsup (optional) or other purchased flavored catsup (optional)
• 4 slices Tomatoes (optional)
• sliced red onion (optional)
• red serrano pepper (optional)