Sautee onion with oil and crumbled vegetable broth cube on a non-stick pan for 4 min, add vegan minced meat and keep sauteing for the next 5 min, occasionally add a bit of water and let it evaporate. Season with pepper and salt and set aside, let it cool down.
Mix flour with lukewarm water and salt into a smooth dough by using a mixer. Separate dough from bowl edges, then drizzle and gently spread a bit of oil over the whole dough.
Drizzle and spread some oil over the clean working surface area, grease it with hand palms. Divide the dough into 9 -10 pieces with oily hand palms. Put each piece onto an oiled surface and drizzle and spread a bit of oil over each. Shape each piece of dough into a flat disk. Grease each disk with oil. Cover all disks with alu foil, let them rest and soften for the next 15 min.
Take a disk and stretch it into a thin dough layer gently by pulling out it's edges. Dough layer should become see-through after stretching. Add some filling (as on image) and roll the dough. Cut the roll into 6 cm long pieces. Take a piece, fold down it's two edges and put it into a baking tray covered with baking paper (as in the image). Repeat this whole step with the rest of the disks and each piece of dough.
Turn on the oven at 180 Celsius degrees. Bake mantels for 40 min (or a bit longer until it's fully baked). Take out from the oven and drizzle baked mantels with 0.5 dcl of water, then return the tray to the oven for the next 3-4 min. Serve warm with good vegan yogurt and seasonal salad.