Prepare the sauce first. Combine all ingredients for the sauce (except the potato starch solution) in a small saucepan and bring to a boil. Let it simmer for 1-2 minutes. Add the straw mushrooms and peas and simmer for 1 minute until mushrooms are cooked. Stir in the potato starch solution and bring to a boil again. Once it's thickened, turn off the heat, cover with a lid and keep warm.
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