I posted a picture of these 
here and Peter asked for the recipe.  So here it is.
My wife actually found the recipe in People magazine of all places, by a guy named Sharone Hakman.  It calls for the cooking to be done in the oven and finished/sauced on the grill.  But I did the whole cooking on the grill; the weather's too nice to be doing these indoors.  
:-)
1/2 cup yellow mustard
1/2 cup stone-ground mustard
1/2 cup pure maple syrup
2 tsp light brown sugar
1 tsp yellow mustard seeds, toasted
1 tsp granulated garlic
1 1/2 tsp black pepper, divided
1 1/2 tsp salt, divided
3-4 lbs baby back ribs, membranes removed
- About an hour before cooking, sprinkle ribs with 1 tsp salt and 1/2 teaspoon pepper.
- Prepare smoker (or grill for indirect heat), target temp between 200*-225*.  I used a medium-sized chunk of apple wood.
- Whisk together both mustards, maple syrup, brown sugar, mustard seeds, garlic, and remaining S&P.
- Place ribs in smoker/grill and cook for one hour.
- Remove ribs and place in heavy duty foil.  Liberally brush both sides with mustard mixture.  Wrap tightly, return to smoker/grill, and cook for another 3-3.5 hours or until done.  Put remaining sauce in the fridge.
- Remove ribs and unwrap.  Set up grill for medium heat.  Brush ribs on one side with mustard mixture, place that side down on the grill, and cook for 3-5 minutes or until sauce begins to caramelize.  Brush top side with sauce, flip over, and again cook for 3-5 minutes or until sauce begins to caramelize.  Repeat this two more times.
-  Remove ribs and let sit for a few minutes before serving.
		
		
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