Steps
1. In a bowl, mash the avocado with a fork until smooth.
2. Add the diced onion, tomato, and cilantro to the bowl.
3. Squeeze the lime juice over the mixture.
4. Season with salt and pepper, then gently mix everything together.
5. Taste and adjust seasoning if needed.
6. Serve immediately with tortilla chips or as a topping for tacos.