For a fresh and flavorful burger, try this guacamole burger recipe. Mash ripe avocados with lime juice, salt, and pepper to make guacamole. Form ground beef into patties and season with salt and pepper. Cook on a grill or stovetop until desired doneness is reached. Top with guacamole and serve on a toasted bun with lettuce, tomato, onion, and additional toppings of your choice.