Grate the sweet potatoes (either with a box/hand grater or a food processor fitted with a coarse grating disc). Heat the olive oil in a large non-stick skillet over medium-high heat. Add the shallots and cook, stirring, until beginning to brown, about 2 or 3 minutes. Add the sweet potatoes and cook, tossing occasionally, until tender, about 7 to 9 minutes more (or longer if you like your potatoes crispier). Add the spinach and cook, tossing, until just wilted, about 1 or 2 minutes more. Note: I like to get my sweet potatoes really browned, so I may end up cooking them a bit longer before adding the spinach. Optional; add salt and/or pepper to taste. You could also add hot sauce to taste. It's up to you! Enjoy!