Heat olive oil in a frying pan over medium-high heat. Sauté onion until softened and starting to colour. Add the crumbled tofu and stir about for a minute or two.
In a small bowl combine the yeast, oregano, turmeric, salt and pepper with the water and whisk with a fork until smooth. Pour over the tofu and stir to combine. Bring to a boil and let cook until all the liquid has evaporated.
Mash the avocado with the lemon juice, add salt and pepper to taste. Dress the greens.
To assemble, divide the avocado mixture amongst the four tortillas, top with the tofu scramble, sprouts and greens. Roll up and enjoy!