1. Prepare bulgur according to package directions.
2. While bulgur is cooking, place 5 teaspoons oil and shallots in a large skillet over medium-low heat. Cook until the shallots start to brown (4-6 minutes). Add garlic and cook, stirring, until fragrant (15 seconds).
3. Add mustard greens, dates, and 2 tablespoons water. Cook, stirring occasionally, until the greens are tender and the water evaporates, adding more water if needed to keep the pan from going dry before greens are tender (4 minutes).
4. Stir in vinegar, salt, and cooked bulgur. Cook until heated through (1 minute). Drizzle with the remaining 1 teaspoon oil and sprinkle with the walnuts to serve.