Hull and slice the strawberries and set in a bowl. Stir in the red onion, jalapeño, cilantro, lime, and salt. Cover and set in the fridge until you're just about ready to eat.
Just before serving, cut the avocados in half, remove the pit, and dice. This keeps the avocado from browning. Stir the avocado into the strawberry mixture and season to taste if necessary.
Notes
Store leftover salsa in an airtight container in the fridge for up to 2 days. The avocado may brown slightly, but it will still be delicious!
You can make this in advance, but I recommend waiting to add the avocado until just before serving to keep it from getting mushy or discolored.
This recipe has a mild to moderate amount of heat from the jalapeno. If you’re sensitive to spicy food, start with a smaller amount or remove the seeds before dicing. You can also leave it out entirely.