Slice and dice the red onion, shallot and celery and place in a large bowl. Finely dice the red chili or serrano pepper and roughly chop the tomatoes. Scrape all of this, and the juice, into the bowl and dress with the juice of 1 1/2 lemons and 2-3 times as much good extra virgin olive oil. Toss to coat and season to taste with kosher salt and pepper. Add the diced salami and stir.