Spicy Avocado-Stuffed Eggs

1/4 cup mayonnaise

1 tablespoon fresh lime juice

1 teaspoon wasabi paste (Japanese horseradish paste)*

1/4 teaspoon salt

Pinch freshly ground black pepper

1 plum tomato, seeded and finely chopped

1 scallion , finely chopped

1 serrano chile, seeded and minced

1 firm-ripe Hass avocado , halved, peeled, pitted, and diced

*Available at Asian markets and some supermarkets