To make the burger, add the black beans, rice, shallot, salt, paprika, 1/4 tsp mustard powder and breadcrumbs to a blender with plenty of seasoning and blitz until still a little chunky, but well combined. Divide the mixture into four and shape into burgers. Transfer to the fridge and chill for 20-30 minutes.
2
To prepare the sautéed onion, heat the olive oil in a small frying pan and add in the sliced onion. Add salt and a little splash of water and allow to cook on a medium heat for 20-25 minutes until completely soft and golden.
3
To make the chipotle mayo, add the silken tofu to a blender with the juice of 1 lemon, 1/4 tsp mustard powder, chipotle sauce and seasoning and blitz until smooth. Transfer into a bowl and set aside.
4
Prepare the smashed avocado by spooning the avocado flesh into a bowl with the juice of 1 lemon and plenty of seasoning. Smash with the back of a fork until broken up but not smooth.
5
Finally cook the burger. Add the remaining 1 tbsp olive oil to a large frying pan and fry the burgers on high until the crust is golden and they are cooked through. Around 5-7 minutes, turning occasionally.
6
To assemble the burger, half and toast the bun until golden. Spread the bottom half with chipotle mayonnaise and then rocket. Top with a burger and then the avocado and sautéed onions on top. Insert a skewer to keep it together and serve immediately.
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