I find the taste of green bell peppers a little strong and substitute poblano pepper. If you want to take the heat up a notch, you could also add diced jalapeno pepper, as well!.
4 ounces cremini or white button mushrooms, chopped
1red bell pepper,cored, seeded, and chopped
1poblano pepper,cored, seeded, and chopped
1 1/2 cups low sodium tomato sauce
3 cloves garlic, very finely chopped
1 tablespoon mustard
1 tablespoon cider vinegar
1 tablespoon brown sugar
1 tablespoon paprika
1 tablespoon Worcestershire sauce
1 tablespoon tomato paste
Coarse kosher salt and freshly ground black pepper
Hamburger buns,for serving
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Instructions
Heat the oven to 350°. In a medium casserole combine the beef, onion, mushrooms, peppers, tomato sauce, garlic, mustard, vinegar, brown sugar, paprika, Worcestershire sauce, and tomato paste. Season with salt and pepper. (To taste and adjust for seasoning, simply cook a teaspoon or so of the mixture in the microwave.)
Alternatively, to cook on the stovetop: Heat a large skillet over medium high heat. Add 1 teaspoon of canola oil. Add the onion, mushrooms, and peppers. Cook until just tender, about 5 minutes. Add the ground beef and stir to combine. Season with salt and pepper. Add the tomato sauce, garlic, mustard, vinegar, brown sugar, paprika, Worcestershire sauce, and tomato paste. Season with salt and pepper. Taste and adjust for seasoning with salt and pepper.
Transfer to the oven and cook for 15 minutes. Stir to combine. Return to the oven and continue cooking until the meat is cooked through and measures 160°F when measured with an instant read thermometer, an additional 15 minutes. Scoop the Sloppy Joe mixture onto buns and serve immediately.