Preheat your pizza oven to 650℉ (I used the Ninja Woodfire Outdoor Oven and, additionally, added wood pellets with the 'Woodfire Smoke' setting to add a smoky flavor). Cut the stems off of your bell peppers and jalapeño. Remove the seeds from the bell pepper (you can remove the seeds from the jalapeño as well if you prefer less spicy salsa).
Remove the skin from the onion and slice it into quarters.
Place the onions, bell peppers, and jalapeño in a small baking pan.
Place the vegetables in the pizza oven and let them roast for 5 to 6 minutes until the outsides are charred, and the peppers are soft.
Remove the vegetables from the pizza oven.
In a blender or food processor, add the roasted vegetables, tomatoes, garlic cloves, cilantro, water, a squeeze of lime juice to taste, and Kosher salt.
Blend until the salsa reaches your desired consistency.
Serve immediately or store in the fridge for up to 1 week.