For the flatbreads, mix all the ingredients together and knead either by hand or in a mixer until combined and a smooth dough is formed. Cover and rest for at least 1 hour.
Meanwhile, combine all the slaw ingredients in a large bowl and mix thoroughly. Season with salt and pepper.
Divide the dough into 6 and roll out to a thickness of about ½cm.
Heat a frying pan until hot, lightly oil and add the first flatbread. Cook until it’s golden on the underside, then flip over and cook on the other side until golden. Repeat with the remaining flatbreads until they are all cooked.
To serve, spread the flatbreads with the almond yogurt, then top with the chipotle slaw, flaked mackerel and toasted sesame seeds.