- 1 tablespoon soy sauce
- 2 teaspoons fresh lemon juice
- 1 teaspoon sugar
- 1 medium yellow summer squash (6 oz)
- 1/2 tablespoon vegetable oil
- 1 bunch watercress (6 oz), coarse stems discarded
- 1/2 teaspoon sesame seeds, toasted
- Stir together soy sauce, lemon juice, sugar, and a pinch of salt in a small bowl.
- Cut a 1/4-inch-thick slice lengthwise from each of the 4 sides of squash. Discard squash core, then cut slices lengthwise into 1/8-inch-thick strips.
- Heat oil in a 10-inch skillet over moderately high heat until hot but not smoking, then sauté squash, stirring, 1 minute. Add watercress and half of soy mixture, then cook, stirring, until watercress is just wilted, about 1 minute. Transfer vegetables with tongs to a small bowl, discarding any excess liquid. Drizzle with remaining soy mixture and sprinkle with sesame seeds. Serve immediately.