Step 1

In a medium bowl, using your hands, mash the beef with the baking soda. Let it sit on the counter for 20 to 25 minutes to tenderize.

Step 2

Preheat the oven to 350°F and set a rack in the middle position.

Step 3

Heat the butter in a large skillet over medium heat until bubbling. Add the onion, bell pepper, and garlic and cook, stirring frequently, until softened, 4 to 6 minutes.

Step 4

Add the beef, salt, pepper, smoked paprika, cumin, oregano, and dry mustard and cook, breaking up meat with wooden spoon, until mostly brown, about 3 minutes. Add the tomato sauce, tomato paste, Worcestershire sauce, and hot sauce. Reduce the heat and simmer, uncovered, until the sauce is thickened, about 10 minutes.

Step 5

Meanwhile, butter the inside of the buns and place on a baking sheet, butter side up. Toast in the oven until warmed through and lightly crispy, about 5 minutes.

Step 6

Taste the sloppy Joe mixture and adjust seasonings. (If you like your Sloppy Joes sweet, feel free to add 1 teaspoon of brown sugar.) Spoon the mixture onto the toasted hamburger buns and serve.