It totally depends on how spicy you want your Salsa to be! If you want a mild spicy flavour, then you can opt for Banana Peppers, Anaheim Peppers or Green Chile Peppers. For a medium spicy taste, add Jalapeno to the tomato mixture. For extra spicy flavour, add in more quantity of Jalapeno or Serrano Peppers. Cut the top of the pepper, take out the seeds and finely chop them before adding to the Salsa.