Category: not set
Cuisine: not set
1 medium-size yellow onion finely chopped
2 large celery stalks finely chopped
2 1/2 to 3 1/2 cups dashi or chicken stock
3 cups leftover mashed potatoes
1/4 cup whole milk (optional)
1/2 teaspoon kosher salt or to taste
1/4 teaspoon black pepper or to taste
Unsalted butter and soy sauce for serving
Chopped mitsuba or celery leaves for garnish
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