Water | 4 cups |
Kombu square | 3-inch square |
Shiitake, dried, rinsed | 3 medium |
Duck breast | 2 6-ounce |
Salt, kosher | ½ teaspoon |
Soy sauce | 3/4 cup |
Hon mirin | 2 tablespoons |
Sugar, cane | 1 ½ tablespoons |
Leek, white & green parts only, cut into 2- x ¼-inch strips | 1 medium |
Sake | 1 tablespoon |
Lemon or yazu peel strips, lengthwise into 1/8-inch strips | 2 |
Ginger, peeled, cut into strips | 1 ½ inch |
Mitsuba or cilantro | Garnish |
Serrano chile | Garnish |
Soba noodles, cooked |
- Sprinkle duck breasts all over with salt; place on plate, skin side up, on a plate, and refrigerate, uncovered, at least 8 hours or overnight.
- Stir together the water, kombu, and shiitakes in a medium bowl; let stand at room temperature at least 8 hours or overnight.
- Remove the kombu and mushrooms; discard the kombu or, if desired, reserve to make another batch of dashi, reserve and slice the mushrooms.
- Combine the soy sauce, hon mirin, and sugar in a large saucepan.
- Cook over medium heat, stirring occasionally, until the mixture just beings to simmer and the sugar is dissolved, about 3 to 4 minutes.
- Stir in the dashi, leek, mushrooms, and sake; bring to a boil over medium-high heat.
- Reduce heat to medium-low; simmer, stirring occasionally, until the leek is tender and the mixture has reduced to about 4 cups, 20 to 25 minutes.
- Cover dipping sauce, and keep warm over low heat until ready to serve.
- Heat a medium skillet over medium heat.
- Place the duck breast, skin sides down, in the skillet; reduce heat to medium-low.
- Cook, undisturbed, occasionally spooning off drippings from the skillet, until the fat is rendered and the skin is golden brown, 10 to 12 minutes.
- Flip the duck breast; cook until a thermometer inserted in the thickest portion registers 130°F for medium-rare, 2 to 4 minutes.
- Transfer to a cutting board; let rest 10 minutes.
- To serve, divide the dipping sauce evenly among four bowl.
- Cut the duck breasts crosswise into ¼-inch-thick slices, and add to the bowls
- Top evenly with citrus peel and ginger strips; garnish with mitsuba and serrano.
- Serve immediately with cold soba noodles.