Peel and slice the plantain in thin slices.
Peel and slice the beetroot the same way. You can just cut thin slices with a peeler/knife. I peeled the Sweet potatoes and created ribbons with a peeler.
Or you can use the Mandolin to slice all the veggies into thin slices.
Fry them in batches, separately in a oil – med-high.
Beetroot usually takes v less time and has to be done in high heat and taken out faster otherwise it would absorb lots of oil.
Drain them in paper towels. You can bake them too at 450F for 10-20min depending on your oven. Season them as soon they come out hot.