Buffalo (Or Beef) Burger

• 1 tablespoon vegetable oil
• 1 onion, diced
• 1 egg
• 2 2 teaspoons rosemary or 2 teaspoons oregano (or 1/2 tsp/2 mL dried)
• 2 teaspoons Dijon mustard
• 2 teaspoons prepared horseradish
• 1/2 teaspoon salt
• 1/2 teaspoon pepper
• 8 ounces medium ground beef
• 8 ounces ground buffalo meat
• 4 kaiser rolls or 4 hamburger buns
• 4 leaves lettuce
• 1 tomatoes, sliced
• 1/2 small red onion, thinly sliced

1. In skillet, heat oil over medium heat; fry diced onion, stirring occasionally, until softened, about 5 minutes.
2. Let cool.
3. In large bowl, beat egg.
4. Stir in thyme, mustard, horseradish, salt and pepper; mix in onion, beef and buffalo.
5. Shape into four 1/2-inch (1 cm) thick patties.
6. (Make-ahead: Cover and refrigerate for up to 6 hours. Or layer between waxed paper in airtight container and freeze for up to 1 month; thaw in refrigerator.) Place patties on greased grill over medium-high heat; close lid and cook, turning once, until no longer pink inside, about 10 minutes.
7. Cut rolls in half; place, cut sides down, on grill and toast until golden, 1 to 2 minutes.
8. Layer burgers, lettuce, tomato then onion on bottoms; sandwich with tops.

vegetable oil, onion, egg, rosemary, mustard, horseradish, salt, pepper, ground beef, ground buffalo meat, kaiser rolls, leaves lettuce, tomatoes, red onion

Taken from www.food.com/recipe/buffalo-or-beef-burger-67796 (may not work)