Mix all ingredients together (if not serving right away, leave out feta until ready to serve)
Serve with tortilla chips
Notes
Variations:-Apple cider vinegar instead of lemon juice for a more bitey flavor-Parsley instead of cilantro-Black eyed peas in addition to black beans (gives more color variation)-Add chopped red onions, bell peppers, etc. -Add diced avocado or green onions just before you are planning on serving.