3 beef lamb burgers roasted Recipes

salted roasted pistachios, coarsely chopped onion , plus 4 onion slices (1/4 in. thick), egg white, whisked to blend, ground lamb, ground beef, baharat* (arabic spice blend ), black pepper, aleppo pepper*, divided, kosher salt, pear tomatoes (any color ), mayonnaise, lemon juice, olive oil, hamburger buns, split, butter lettuce leaves

buns, roasted tomato and three chile salsa, lettuce leaves, paper-thin slices white onion