Bok Choy

2 tablespoons vegetable oil 2 medium garlic cloves, minced 1 teaspoon freshly grated ginger (from 1/2-inch piece) 1/4 teaspoon red pepper flakes 1 1/2 pounds bok choy (about 2 medium bunches), cleaned, ends trimmed, and cut on the bias into 1-inch pieces … Continued