Seared Ahi Tuna Steaks: My Sesame-Crusted Secret!

Ingredients

• 2 Ahi tuna steaks (6-8 oz/170-225g each), sushi grade
• 2 tablespoons sesame seeds (mix of black and white for visual appeal is nice)
• 1 tablespoon olive oil
• 1/2 teaspoon sea salt
• 1/4 teaspoon black pepper
• 1/4 cup mayonnaise (good quality, like Hellmann's/Best Foods)
• 1 teaspoon wasabi paste (adjust to taste)
• 1 teaspoon rice vinegar
• 1/2 teaspoon soy sauce
• Green onions, thinly sliced (optional)
• Pickled ginger (optional)
• Soy sauce, for serving (optional)