Preheat the oven to 350 °F
Place the beet cubes on a lined baking tin, rub with olive oil and roast for 30 minutes
Remove from the oven and set aside to cool
Place the roasted beets in a food processor and pulse two or three times, don’t mash them completely
Transfer the beets to a large bowl, add all the other ingredients and stir to combine
With slightly wet hands, shape the burgers and place them on a lined baking sheet
Bake for 15 minutes on one side, then flip over and bake for 15 more minutes
While the burgers are baking, prepare the dressing
Place all the ingredients in the food processor and process to obtain a creamy sauce
Cut the bun in halves and place in oven for 2 minutes
Add some salad, the burger, dressing and put on the bun top
Serve immediately