Cut the rhubarb into thin slices using a mandoline or slicer.
Heat the sugar water and add the beetroot juice.
Place the rhubarb in the hot sugar water and wait until it becomes transparent.
Place the rhubarb on a silicone mat and put in a drying oven and dry at 50°C for 24 hours.
Peel the other rhubarb stalks, boil the peels in the sugar water for a short time and strain them out.
Vacuum the rhubarb stalks with the sugar water and cook for 20 minutes at 65°C.
Cool using iced water and store in the refrigerator until use.