Shrimp Ceviche

Ingredients

• 1 pound peeled and deveined raw medium shrimp, thawed if frozen
• 1/4 cup freshly squeezed lemon juice (from 2 lemons)
• 1/4 cup freshly squeezed lime juice (from 2 to 3 limes)
• 2 medium tomatoes, seeded and chopped
• 1/2 small red onion, finely chopped
• 1 medium jalapeño, seeded and finely chopped (about 3 tablespoons)
• 1/2 cup chopped fresh cilantro leaves and tender stems
• 1/2 teaspoon kosher salt
• 1 medium avocado
• Tostadas or tortilla chips, for serving (optional)