Combine all ingredients in a medium bowl. Mix well, mashing the avocados with a fork until desired consistency is reached. Cover tightly with plastic wrap and refrigerate until ready to serve.
Add spice. The onions and garlic add a nice zing to guac, but consider these spicy extras for an even spicier recipe: chopped jalapeno peppers (up to 1 whole, minced), cayenne pepper (up to 1 tsp), red pepper flakes (up to 2 tsp), hot sauce of your choice (to taste), diced green chiles or additional black pepper.Add texture. Guac can have a bit of a mushy texture when over-mixed and these ingredients will spruce up the texture profile (add up to 1 cup total): salsa, diced or chopped tomatoes, extra chopped red onion, green onion slices or finely chopped bacon.Add flavor. If you find that your batch of guacamole needs a boost in flavor consider adding any of the following (add in small bits and taste test as you add!): Extra salt, garlic salt, taco seasoning, Worcestershire sauce, chopped mangos or other tropical fruit or crab meat.Add creaminess. Maybe your guac is too chunky and you need to add a touch of creaminess. If this is the case, add between 1/2-1 cup total of the following: cream cheese (softened), sour cream or a blended (not chunky) salsa.