Tuna Burgers with Ginger Lemon Mayonnaise

Ingredient:

• 1 cup mayonnaise
• 2 tablespoons soy sauce
• 2 tablespoons finely chopped cilantro
• 2 tablespoons finely chopped scallion greens
• 1 tablespoon black sesame seeds or toasted sesame seeds
• 2 teaspoons finely grated fresh ginger
• Finely grated zest of 1 lemon
• 2 teaspoons fresh lemon juice
• Freshly ground black pepper
• 2 Kirby cucumbers, thinly sliced
• 1/4 medium red onion, thinly sliced
• 3 tablespoons rice vinegar
• 1 tablespoon sugar
• 1 teaspoon kosher salt
• Freshly ground black pepper
• 2 teaspoons finely grated fresh ginger
• 1 garlic clove, smashed
• 1 Thai or serrano chile, seeded and minced
• 1 teaspoon sugar
• 2 tablespoons fish sauce
• 2 tablespoons finely chopped cilantro
• 1 tablespoon finely chopped basil
• 1 1/2 pounds sushi-quality tuna
• 1 1/2 tablespoons vegetable oil
• 1 1/2 teaspoons sesame oil
• 4 hamburger buns
• 2 tablespoons dry-roasted peanuts, finely chopped