Ingredients
- 1 1/2 cups rice vinegar
- 2 serrano chilies, halved and seeded (use 1 for milder flavor)
- 1 1-inch piece fresh ginger, peeled and cut into thirds
- 2 tablespoons sugar
- 1 tablespoon kosher salt
- 1/2 teaspoon red pepper flakes
- 3 medium zucchini, cut into 1/4-inch slices
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