This is the base guacamole recipe from Gabriel's in Santa Fe, New Mexico. It is intended only as a jumping-off point: Add more seasonings to your taste. We preferred it with 1/2 teaspoon jalapeño, 4 teaspoons onion, and 4 teaspoons lime juice.
Makes 2 cups (serving size: 1/4 cup)
Scoop out avocado flesh into a molcajete or bowl, add garlic and jalapeño, and mash (with a pestle or a wooden spoon) until the avocados are creamy but still very chunky. Stir in tomato, onion, and salt to taste. Sprinkle with lime juice and cilantro, then stir and taste once more. Add more garlic, jalapeño, onion, salt, lime juice, or cilantro as desired. Serve with tortilla chips.