For the Vegetable – 1 head cauliflower (cut florets) – 2 sweet potatoes (cut cubes) – 1 tablespoon extra virgin olive oil – ½ teaspoon salt – ¼ teaspoon pepper – ¼ cup parsley (minced) For the Tahini Sauce – 2 tablespoons tahini – 1 juice and zest of lemon – 1 clove garlic (grated) –½ teaspoon salt – ¼ cup hot water