Nothing easier than this high-protein flavourful substitute, made of TSP (textured soy proteins).
Melt the Marmite into boiling water and soak the soy proteins for 15 minutes.
Meanwhile finely chop the onion and chili (removing the seeds), and cut the tomatoes into dices.
Sauté the onion white and the chili pepper for a few minutes in the olive oil, then add the tomatoes, cover and reduce for 5 minutes on low heat, stirring regularly.
Drain the soy proteins, add to the pain and cook for another 5 minutes.
Add the lime juice, chopped coriander, season to salt and pepper and sprinkle with the green of the onion.