| ⅓ packed cup cilantro leaves and tender stems | chop cilantro, avocado, onion and tomato; combine with dressing and tuna | divide tuna salad among tostada shells and top with hot sauce |
| 1 large ripe Hass avocado |
| ½ small red onion |
| 1 medium tomato |
| 2 medium garlic cloves, finely grated | mix garlic, serrano, lime juice, mayonnaise, salt and pepper into dressing |
| 1 serrano chile, finely diced |
| 1 lime, juiced (about 2 tablespoons) |
| 2 tablespoons mayonnaise |
| Salt and pepper |
| 2 (5-ounce) cans tuna packed in oil, drained |
| 6 tostada shells |
| Hot sauce, for serving (optional) |