1 medium onion , halved and sliced thin (about 1 cup)
1 cup low-sodium chicken broth
1/3 cup maple syrup
3 tablespoons balsamic vinegar
3 tablespoons whole grain mustard
Table salt and ground black pepper
Pour off any fat from skillet in which pork was cooked. Add oil and heat skillet over medium heat until shimmering. Add onion and cook, stirring occasionally, until softened and beginning to brown, 3 to 4 minutes. Increase heat to medium-high and add broth; bring to simmer, scraping bottom of skillet with wooden spoon to loosen any browned bits. Simmer until liquid is reduced to 1/3 cup, 3 to 4 minutes. Add syrup, vinegar, mustard, and any juices from resting meat and cook until thickened and reduced to 1 cup, 3 to 4 minutes longer. Adjust seasonings with salt and pepper, pour sauce over pork, and serve.
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