Slice the tofu: Halve your slab of tofu lengthwise through the middle so you have two large, 1-inch thick slabs. Stack the slabs on top of each other and slice them into 4 columns lengthwise, then turn the tofu and slice across the columns to make ¼-inch wide squares of tofu. Gently transfer the tofu to the serving bowl.
Prepare the vegetable noodles: Use a julienne peeler, mandoline, spiralizer or regular peeler to create noodles out of the radish, carrots and zucchini, if using. Transfer the noodles to a large serving bowl. Add the bean sprouts, onions, chopped cilantro and sesame seeds to the bowl.