Prep the Kale - Strip the leaves from the stems, then slice or tear the leaves into bite-sized pieces. Wash and dry the kale.
Peel and Slice the Onions - Remove both ends of the onion and peel the skin. Slice across the equator of the onion so that you have a stack of rings, then just cut through the radius.
Crisp the bacon - Dice the bacon, then cook it in a large skillet over medium-high heat until it's very browned and crispy. Remove the bacon bits from the skillet using a slotted spoon, and drain on a paper towel.
Sauté the onions - Add the onion strings to the bacon fat, and sauté until very soft and almost caramelized.
Add the kale and cook - Add the kale to the skillet with the onions, and cook, stirring occasionally, until the kale is soft and compliant.
Garnish and Serve - Garnish with the bacon bits, and serve.