Classic Seviche Tostadas | Tante Marie's Kitchen

Ingredients

• 1 lb. very fresh boneless, skinless, ocean fish fillets
• 6 to 8 limes
• 1 large round, ripe tomato, cut into small dice
• 3 or 4 fresh serrano chiles, stemmed and finely chopped
• 3 Tbs. finely chopped cilantro leaves, plus several dozen for garnish
• 1/2 cup finely diced white onion
• 2 to 3 Tbs. olive oil
• 1 tsp. coarse salt
• 1 tsp. sugar (optional)
• 1 large ripe avocado, peeled, pitted, and cut into 1/2-inch dice
• 36 crisp tortilla chips