Spiced Tuna Tartare with Cucumber Relish Ponzu and Black Sesame Seeds

• 2 pounds sushi grade tuna, small dice
• 1 teaspoon salt
• 1/8 teaspoon cayenne pepper
• 1/4 cup extra virgin olive oil
• Fresh white pepper, to taste

Cucumber Relish:

• 1 English cucumber, brunoise, with no seeds
• 1 teaspoon black sesame seeds
• 1/2 teaspoon salt
• 1 tablespoon pickled ginger, minced
• 1 jalapeno, brunoise, no seeds
• Juice of 1 lemon

PONZU SAUCE:

• 1 cup lemon juice
• 1 cup soy sauce
• 1 cup chicken stock
• 1 1/8 cup chili oil
• 1/3 cup sesame oil
• 1 teaspoon butcher ground pepper
• Pinch ground cumin
• 1 teaspoon grated ginger