For the tempura dough, mix tempura flour, 1 egg yolk and 1/4 litre of cold water and place in the fridge. Place the egg, 1 egg yolk, lemon juice and mustard in a tall mixing bowl. Puree with a blender, slowly adding oil.
Drain the beetroot and collect the juice. Cut 150 g beetroot into small cubes, use the remaining beetroot for other purposes. Puree half of the beetroot cubes and mix with 3-4 tbsp. beetroot liquid into the mayonnaise.
Fold in remaining beetroot cubes. Season to taste with salt and chill until used.
Clean and wash the cauliflower, cut into small florets and blanch in boiling salted water for about 4 minutes. Remove the outer chicory leaves. Wash the chicory and cut in half lengthwise. Drain the cauliflower and let it drain well in a sieve.
Caramelise the sugar in a large pan until light brown. Deglaze with orange juice, soy sauce and cream. Add butter and bring to the boil once. Add the chicory to the orange stock and simmer for about 10 minutes at low heat.
Heat frying oil in a wide pot to approx. 175° C (use fat thermometer). Pull the cauliflower florets through the tempura dough with a fork, let them drip off a little and fry them in the hot oil for 2-4 minutes, turning from time to time.
Drain on kitchen paper.
Remove the chicory from the stock and arrange on plates. Add beetroot mayonnaise and cauliflower and garnish with beetroot leaves.