This is a delicious glaze for fish, chicken, or pork (probably not a good match for beef or other dark meat). We had it on cod a few nights ago and it was well received by the housemates.
1/2 cup real maple syrup (get the real stuff, not the corn syrup crap)
1/2 cup apple cider vinegar
2 Tbsp good mustard, the kind with whole mustard seeds (not the bright yellow picnic paste stuff)
pinch of kosher salt
1 Tbsp orange marmalade (perfect for using those tiny jars you get in meat & cheese gift sets)
1 clove garlic, minced
tiny bit of freshly ground pepper
Instructions: mix all together in a small saucepan and simmer gently until slightly reduced & thickened (about 5-10 minutes) – you can do this while your meat is baking. Spoon the glaze over the fish / meat just a couple of minutes before taking it out of the oven; you want it to caramelize a little but not burn.