Rinse the quinoa, then simmer with the sweet potato in lightly salted water for 10 mins, or until tender. Drain well and leave to cool.
Mash the beans into the quinoa and sweet potato. Stir in the onions, chia seeds, H&B Savoury Fibre Mix, sun-dried tomatoes, vegan mayo, chilli flakes, lime zest and juice.
Chill for up to one hour. Shape into four burgers or six sliders. If using, lightly dust with buckwheat flour, then chill for at least two hours.
Heat the olive oil in a frying pan over a medium heat. Cook the burgers for four mins per side until golden.
Spread burger sauce onto toasted slider buns, add the burgers and top with pickled beetroot.
