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In a bowl, mix the chickpea flour with the water, and set aside for about 30 minutes (or overnight) in the refrigerator.
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In a saucepan filled with water, boil the potatoes until just tender to par-boil them. Set them aside to cool, then cut them into thin even slices.
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When ready to make the frittata, preheat the oven to 350°F (180°C).
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Pour the chickpea mixture, tofu, nutritional yeast, salt, pepper, and cayenne pepper into a food processor fitted with the s blade, and process until a smooth batter forms. Set aside.
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Wash the leeks, and then slice into rounds.
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In a large cast-iron oven-proof skillet, heat the oil over medium-low heat, and sauté the onions for about 10 minutes, until golden. Add the sliced potato and the leeks, and cook for about 5 minutes until softened. Pour the chickpea batter into the pan, and stir lightly until the veggies are evenly distributed.
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Place the skillet in the oven, and bake for 25 to 35 minutes, or until the top is set. Top the frittata with the parsley and green onions.
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Serve hot, with arugula and avocado on the side.