What kind of ham should I buy?
The easiest option is a fully cooked spiral-sliced ham (bone-in or boneless). Since it is already cooked, you are really just reheating and glazing. If your ham is labeled “cook before eating,” you will need to follow its package instructions for safe internal temperature.
How much ham per person?
A good rule: about 1/2 pound per person for a bone-in ham, or 1/3 pound per person for boneless. If you want generous leftovers for sandwiches, bump it up.
What internal temperature should reheated ham be?
For a fully cooked ham, aim for 140°F in the thickest part. If it is a cook-before-eating ham, aim for 145°F (and rest 3 minutes).
Where do I put the thermometer in a spiral ham?
Insert it into the thickest part, ideally near the center. For bone-in, avoid touching the bone (it can give a false reading). Spiral hams can heat unevenly, so if you are unsure, take a second reading in another thick spot.
Can I make the glaze ahead?
Yes. Make it up to 5 days ahead and refrigerate. Warm it gently (microwave or small saucepan) so it is brushable.
My glaze looks grainy or thin. Did I ruin it?
Nope. Brown sugar can look grainy at first but smooths out as it heats. Also, this glaze may look a little loose while it is hot, and it will thicken more as it cools and bakes onto the ham. If it still looks separated, whisk in 1 tablespoon warm water.
How do I keep a spiral ham from drying out?
Keep it covered with foil for most of the bake and do the glaze at the end. Also, do not overcook it. A thermometer is your best friend here.
Do I need to scale the glaze for a bigger ham?
This amount is perfect for an 8 to 10 pound ham. For a smaller ham, you can make the full batch and just use what you want. For a larger ham, scale the glaze up by 1.5x for 12 to 14 pounds.
Any allergy notes?
This recipe contains dairy (butter) and mustard (Dijon). Swap in plant butter if needed, and choose a mustard that works for your household.