1. Mash the avocados with a fork in a medium bowl.
2. Add lemon and lime juice and salt. Mix together.
3. Add onion and jalapeño to avocado and stir to combine.
4. Stir in cilantro and taste, adjusting seasoning as necessary.
Tips for What to Do With Excess ingredients: Excess lemon can lime can be added to water or other drinks. The juice can also be used in salad dressing and on steamed vegetables. Excess onion can be added to sandwiches and salads or can be roasted with vegetables.