What is dry mustard and where do I get it?

In case anyone is interested, here is the recipe that I'm using dry mustard in. It looks great! I just need to know what dry mustard is! Thanks you... Cumin, Honey, and Miny-Marinated Lamb Chops 1/4 cup chopped fresh mint 1 tablespoon balsamic vinegar 2 teaspoons ground cumin 1 teaspoon dry mustard 2... show more In case anyone is interested, here is the recipe that I'm using dry mustard in. It looks great! I just need to know what dry mustard is! Thanks you...

Cumin, Honey, and Miny-Marinated Lamb Chops
1/4 cup chopped fresh mint
1 tablespoon balsamic vinegar
2 teaspoons ground cumin
1 teaspoon dry mustard
2 teaspoons honey
1/2 teaspoon salt
1/2 teaspoon ground pepper
8 (4 ounce) lamb loin chops, about 1 inch thick

Combine first 7 ingredients in a small bowl, stirring well
Place lamb in a single layer in a shallow dish and run spice mixture evenly on both sides. Cover and refrigerate for 4 hours.
Grill/broil for 4 minutes on each side.
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