Blackened Ahi Steak Sandwich

Ingredients

• 1 cup mayonnaise
• 2 tablespoon wasabi paste
• 2 tablespoon tamari soy sauce
• 1 tablespoon fresh lime juice
• 1 tablespoon freshly frated ginger
• 4 saku tuna steaks (5 ounces each)
• salt and freshly ground black pepper
• 2 cup daikon radish sprouts
• 4 sweet rolls, such as kings hawaiian buns
• 1 fresh avocado, sliced
• oil, for searing
• 4 slices beefsteak tomato