Whole Roasted Sake Salmon in Banana Leaves

Name: Whole Roasted Sake Salmon in Banana Leaves
Ingredients: 1 whole 5 pound salmon, scaled, eviscerated and fins trimmed; 1 lemon, sliced into rounds; 1/4 cup sake; 2 tablespoon bean paste; 2 tablespoons salt; 3 tablespoons Szechuan peppercorns, coarsely ground; 2 tablespoons lemon juice; 1/4 cup vegetable oil; 2 packages banana leaves