If you like a bit more bite try a 50/50 sauce and lemon juice combination.
If you have the time marinade your meat for an hour or so first.
If you are baking a roast cut small holes in the top of the meat and insert the rosemary a little way in.
If I'm feeling lazy on clean up I use an oven bag and tear the bag open for the last 30 minutes.
Lamb is a fatty meat don't run away from this when you see what's in the bottom of the dish, it's what keeps the meat moist and you pour it away.
Can BBQ instead of oven bake.