Dice veggies into similar-sized pieces. Set aside. Juice lime and set aside.
In a large bowl, combine onion, jalapenos, and salt. Allow the mixture to marinate for 5 minutes.
Add tomatoes and cilantro to the mix. Stir to combine. Cover salsa with plastic wrap or pop it into an airtight container. Let it sit in the fridge for at least 15 minutes before serving. Enjoy!