Preheat the oven at 175°C/347°F.
Place the beet root 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 - you need some texture for the burgers, so make sure you don't mash them completely.
Transfer the beets into a large bowl, add all the other ingredients and stir to combine. If the texture is too mushy add more bread crumbs until you obtain the desired consistency.
With slightly wet hands, shape the burgers and place them on a lined baking sheet.
Bake in the oven for 15 minutes on one side, then flip over and bake for 15 more minutes.
Place the sweet potato strips on a lined baking sheet, rub with olive oil, than sprinkle with cornmeal and toss to combine.
Bake for 25-30 minutes, or until golden brown. They will be ready in the same time with the burgers.
While the burgers are baking, prepare the dressing and the buns. Place all the ingredients in the food processor and process to obtain a creamy sauce.