Mix the flour, yeast and salt in a large bowl. Add the water and olive oil and mix into a dough.
Knead the dough for 3-4 minutes until soft and smooth then cover and leave to rise in a warm place for 45 minutes until roughly doubled in size.
Divide the dough into 6-8 equal balls, (depending on whether you want smaller or larger flatbreads).
Roll each dough ball into a long, flat shape then drizzle over a little Marmite and sprinkle with vegan cheese. Don't over-fill or they will pop open whilst cooking.
Brush the edges with water then fold in half and squeeze the edges to seal. Roll the folded flatbread again until thin.
Generously grease a large baking tray with olive oil and lay out your flatbreads one by one as you make them.
To cook on the BBQ:
Place each flatbread directly onto the hot BBQ, and leave well alone for 1-2 minutes until one side is cooked. Flip over and cook for a further minute. Serve immediately.
To cook in a griddle or frying pan:
Heat the pan on the hob and place onw or two flatbreads straight into the pan. Leave to cook for 1-2 minutes until puffed up and golden brown then flip over to cook on the other side. Serve immediately.
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Notes
Don't be tempted to over-fill the flatbreads. They only need a small amount of filling as they are rolled so thinly - if you add to much they will burst open when cooking.You can keep the flatbreads soft by wrapping in a clean tea-towel when they have cooked.