In a small pot, whisk together the water and cornstarch. now whisk in the oil, nutritional yeast, black salt, and turmeric.
Set over medium-high heat and whisk while it cooks. Cook for 3–5 minutes, until the dipping sauce thickens to an egg-yolk consistency.
Serve hot with buttered toast, a sprinkle of salt, and a crack of pepper to taste.
