Cut the bacon slices into half-inch thick strips.
Heat a large skillet over medium heat, then add the bacon to the pan.
While the bacon is cooking, peel and cut the onions into 1/4" thick by 2" long slices. Place the onion slices into a bowl and set aside.
Check the cooking bacon. Carefully drain off some of the fat if there seems to be quite a bit of it in the pan. Return the pan the stove to continue cooking.
Peel and finely chop the garlic cloves while you wait for the bacon to finish cooking. Set this in a separate bowl and this bowl aside.
Once the bacon is crispy, remove it from the pan using a slotted spoon. Drain all but 3 tablespoons of the bacon fat from the pan, then return the pan to the stove.