Heat 1 tablespoon grapeseed oil in a Dutch oven over medium heat until shimmering. Add grated ginger and minced garlic; cook 1 minute until fragrant.
Simmer & Season
Pour in 5 cups chicken broth, 1 tablespoon soy sauce, and 1 tablespoon rice vinegar. Bring to a gentle simmer, soft bubbling around edges.
Cook Add-Ins
Nestle in 24 frozen gyoza and 4 oz sliced mushrooms. Cover and cook 6–8 minutes until dumplings float and mushrooms are tender.
Stir in 1 cup shredded napa cabbage and cook uncovered 2 minutes until cabbage wilts with slight bite. Remove from heat and swirl in 1 teaspoon sesame oil.
Notes
In my third test I found rotating dumplings halfway prevents sticking without tearing skins.I store dumplings separately in the fridge to keep skins firm when reheating.Adding thin carrot ribbons brightens color and texture on chilly evenings.