Unagi sauce is a sweet, thickened soy sauce traditionally used on grilled eel. Here, the simple sauce of soy sauce, sugar and mirin is enhanced with the addition of aromatic garlic and ginger, transforming it into a savory glaze for buttery salmon. Once the salmon is roasted and lacquered in the sauce, it becomes the perfect filling for customizable hand rolls. A perfect roll is assembled with the flaked salmon and some creamy avocado and crisp cucumbers for bites that are rich, fresh and crunchy all at once. Including cooked short-grain rice in the filling is traditional, but these rolls would be a great place to use other leftover grains like farro or quinoa.