Crab Salad with Serrano and Kewpie Mayonnaise

Name: Crab Salad with Serrano and Kewpie Mayonnaise
Ingredients: 3 tablespoons Kewpie mayonnaise; 3 tablespoons minced red onion (from 1 onion); 1/2 teaspoon finely grated lime zest , plus 1 tablespoon fresh lime juice (from 1 lime); 1 tablespoon minced fresh cilantro; 1 tablespoon minced fresh mint; 1 1/2 teaspoons minced serrano chile (from 1 stemmed and seeded chile), plus more to taste; Kosher salt, to taste; Black pepper, to taste; 8 ounces fresh Jonah, stone, Dungeness, or other local lump crabmeat , picked over; Toasts, crackers, or endive spears, for serving