Black Bean, Corn and Avocado Salsa

1 can chopped tomatoes
1 can sweet corn
1 can black beans
½ small purple onion chopped finely
2 avocados diced
fresh cilantro to taste
1 large fresh tomato
1 packet good seasons Italian salad dressing mix.
Squirt of lemon or lime

Mix in bowl. Serve with chips, over salad or over any Mexican food. So yummy