Beetroot, feta and lentil burgers with caramelised onion, avocado and rocket

Combine beetroot, lentils, feta, lemon juice, eggs and thyme in a food processor until smooth(ish). Mix with bread crumbs in a large bowl and season to taste.
Heat olive oil in a pan or on a barbecue over medium to high heat. Shape burger mix into patties (six to eight) and add to pan. Cook for about 5 minutes on each side until brown and reasonably firm.
Meanwhile, slice red onion as you like it and add to pan (you may need a second one) or barbecue, tossing now and then as needed.
Once onion is cooking, spread avocado on buns followed by cheese. You may also like to use tomato slices.
Add burgers to buns followed by red onion, sriracha, kewpie and rocket. Enjoy!