Ingredients

2 teaspoons instant dashi powder (Instant dashi is Japanese stock made from bonito (dried tuna flakes) and seaweed)

4 cups water

2 teaspoons finely grated fresh ginger

1/4 pound shiitake mushrooms, stemmed and caps thinly sliced

1/2 cup shelled edamame (3 ounces)

One 14-ounce package firm silken tofu, cut into 1-inch cubes

8 water chestnuts, thinly sliced

One 5-ounce bag baby spinach

2 tablespoons low-sodium soy sauce

2 tablespoons mirin

1 teaspoon fresh lemon juice

1 scallion, thinly sliced

Preparation

In a large saucepan, bring the dashi and water to a simmer.

Add the grated ginger, sliced shiitake, edamame, tofu and water chestnuts and simmer over moderate heat for 5 minutes.

Add the spinach, soy sauce, mirin and lemon juice and stir just until the spinach is wilted. Serve in bowls with the scallion.