If you like raw onion, go right ahead and combine everything. Otherwise, take the edge off by sauteing the onion with a bit of water in a pan over medium heat. The onion is ready once the water has boiled off. If you aren't a fan of cilantro, substitute another herb: mint, savory, or lemon balm work well.

Mix the onion, tomato, and the rest of the ingredients in a bowl. Be sure to add enough salt and pepper!

Taste the salsa. You're looking for a balance of spicy from the peppers, sweet from the tomatoes, and bright and fresh from the herbs and lime juice. If something is out of balance, add the appropriate ingredient to bring it back into balance.

Store in an air-tight container in the fridge. Fresh salsa won't last as long as store-bought salsa because it doesn't have any preservatives, but it's so tasty that I'm sure you'll finish it fast!