Preheat the oven to 425, and get out the roasting pan for all the ingredients.
Arrange the sweet potato chunks in the pan and then drop in most of the lardons/bacon, followed by the asparagus tips and garlic cloves, and finally, the remaining lardons/bacon.
Sprinkle with the thyme, pour the oil over, then bake in the oven for 30 minutes, before turning the sweet potatoes over and bake for another 30 minutes.
Let everything cool a bit, then divide between 2 plates on top of salad leaves (if desired) and sprinkling with some salt or chili sauce as desired.