Peel and cut onion into large dice. Cut the jalapeƱo in half then quarter, de-seed and de-vein. Place onion and jalapeno in container with lime juice, cilantro leaves and 6 to 7 tomato quarters.
Snap cover into place, remove plug cover and insert tamper.
Set machine variable speed to 1.
Turn machine on and slowly turn dial to speed 5.
Blend for about 10 to 15 seconds, using the tamper to push ingredients into the blades.
Reduce speed to 3, remove tamper and add remaining tomatoes thru the lid plug opening.
Blend for about 8 to 10 seconds, using the tamper to push tomatoes into the blades. Try not to over blend so you have a chunky salsa to serve with chips.
Chill and serve with chips or use as a garnish on chicken, taco salad or an omelet.