You will need a mandoline to thinly slice the vegetables.
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In a bowl, whisk the lemon juice with the honey, ginger and garlic; season with salt and pepper. Whisk in the oil.
Using a mandoline on a very thin setting, slice the cucumber, kohlrabi and beet. Stack the slices and cut them into matchsticks.
Toss the kohlrabi and cucumber with the cabbage and bean sprouts, then with the dressing; season with salt and pepper. Toss in the beet and serve.