These make a terrific side dish that goes with just about everything. A little putzy to make but well worth the effort. I got this from a cooking show on PBS at least 10 years ago, I don't even remember what show it was.
Peel and dice sweet potatoes into 1/2 inch dice. Cook in a large kettle of boiling water until just barely tender (3 - 5 minutes). You should feel a slight resistance when you pierce the pieces with a fork. Drain thoroughly.
In a large saute pan, fry the bacon until just starting to crisp.
Add onions to bacon and sautee until translucent.
Remove bacon and onion from pan and set aside leaving drippings in pan.
Add oil to drippings in saute pan.
Add sweet potatoes to the saute pan and stir in the 1 Tbsp of sugar.( The sugar helps to caramelize the potatoes.).
Saute on medium high heat until potatoes start to brown. This takes about 10 - 15 minutes.
Return onions and bacon to pan and cook a few minutes longer.