3 beef burger fillings Recipes

lean ground beef chuck, black or green olive tapenade (sometimes labeled olive paste ), salt, black pepper, grilled or toasted hamburger buns or kaiser rolls, accompaniments: mayonnaise ; coarse-grain mustard; thinly sliced red onion; thinly sliced sweet gherkin pickles; about 2 cups baby romaine lettuce

shredded parmesan cheese, pine nuts, drained (reserve 2 tbsp oil ) coarsely chopped oil-packed dried tomatoes, tomato paste, garlic, peeled, ground beef round or sirloin, beer, salt, pepper, hamburger buns (about 3 oz. each), split in half horizontally, crumbled feta cheese (4 oz.; optional), jalapeno mayonnaise