Cut or chop the bacon into small pieces and add to the inner pot of the Ninja Foodi or a medium size pot on the stove. Dice the onion into a small ¼" dice and add to the pot. Turn the heat on high (Ninja Foodi) and medium (stove)to sauté the bacon.
Once the bacon begins to brown and the fat is rendering, reduce the heat to medium.
Stir occasionally and when most of the fat is rendered and the bacon is crispy add in the tomatoes, brown sugar, and balsamic vinegar. Continue to cook until the tomatoes start to break down and the sauce begins to thicken. Add the salt and red pepper flakes.
Simmer and cook on medium heat (Ninja Foodi & Stove) until the mixture thickens into a jam consistency, this takes about 15 minutes. Pour into containers and let cool.
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