Classic Pico de Gallo

Ingredients (6)

• 1 cup finely chopped white onion (about 1 small onion)
• 1 medium jalapeño or serrano pepper, ribs and seeds removed, finely chopped (decrease or omit if sensitive to spice, or add another if you love heat)
• 1/4 cup lime juice
• 3/4 teaspoon fine sea salt, more to taste
• 1 1/2 pounds ripe red tomatoes (about 8 small or 4 large), chopped
• 1/2 cup finely chopped fresh cilantro (about 1 bunch)