3 ripe avocados, cut into 1/2-inch dice
2 medium ripe tomatoes, seeded and cut into 1/2-inch dice
1 small white onion, finely chopped
1/4 bunch fresh cilantro, chopped
1/2 serrano chile, finely minced
2 small lemons, about 4 tablespoons
1 teaspoon kosher salt
To keep the guacamole from turning brown, press a pit from one of the avocados into the center of the dish. Remove it before serving.