Sloppy Joes

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INGREDIENTS
1 tablespoon olive oil
1 large onion, finely chopped
2 garlic cloves, minced
Coarse salt and ground pepper
3/4 pound ground beef sirloin
1 can (14 1/2 ounces) tomato puree
1/2 teaspoon mustard powder
1 1/2 teaspoons dark-brown sugar
1 tablespoon cider vinegar
16 party-size potato rolls

DIRECTIONS
1. Heat oil over medium in a large saucepan. Add onion and garlic; season with salt and pepper. Cook until softened, stirring occasionally, 6 to 8 minutes.

2. Add beef, and cook, breaking up meat with a wooden spoon, until no longer pink, 4 to 5 minutes. Add tomato puree, mustard powder, sugar, and vinegar. Cook, stirring occasionally, until slightly thickened, 8 to 10 minutes. (To store, refrigerate, up to 2 days.) Serve warm on rolls.

from Martha Stewart