Grate the veggies very fine, using the largest holes on a box grater. Mix them together in a bowl with the oils, salt and pepper, plus scallions and hot sauce if using.
Remove the hard stem/rib of the greens but keep the leaves intact. Rinse the leaves and blanch for a few seconds. Lay out on a platter.
Place the veggies in the middle of each leaf, sprinkle them with walnuts and cubed avocado. Close the leaf like a burrito or a wrap, and enjoy.