mushroom soy sauce — Les Petites Gourmettes

Ingredients

• 2 tablespoons dry sherry
• 2 tablespoons soy sauce
• 1 tablespoon sugar
• 2 teaspoons toasted sesame oil
• 1 pound Ahi tuna steaks, cut into 1-inch pieces
• 3 tablespoons sesame seeds
• 1 teaspoon Chinese five-spice powder
• 1 teaspoon vegetable oil