- 1 pound small kohlrabi bulbs (about 1 bunch)
- 1 bunch watercress
- 1 tablespoon unsalted butter
- 1 tablespoon reserved rendered duck fat from Crisp Duck Breast with Pink Peppercorn Sauce or 1 tablespoon additional unsalted butter
- 2 tablespoons fresh lemon juice
- Peel kohlrabi with a vegetable peeler and cut into 2-inch-long julienne strips. Discard coarse stems from watercress. In a large heavy skillet heat butter and reserved duck fat or additional butter over moderately high heat until foam subsides and sauté kohlrabi, stirring, until crisp-tender, 5 to 10 minutes. Add lemon juice and sauté kohlrabi, stirring, 1 minute more. Remove skillet from heat and immediately stir in watercress. Season vegetables with salt and pepper.