Every night is salsa night!

1 cup finely chopped red onion
1 jalapeno pepper, seeded and finely chopped - or more to taste
2 limes, juiced
2 ½ cups Roma (plum) tomatoes, seeded and chopped
½ cup chopped fresh cilantro
1 teaspoon salt

Mix red onion, jalapeno pepper, and lime juice in a bowl. Allow to stand for 5 minutes. Mix in Roma tomatoes, cilantro, and salt; allow to stand 15 more minutes for flavors to blend.

Source[www.allrecipes.com]