Preheat oven to 450F.
Pat chickens completely dry.
Rub chickens with 1 tablespoon of butter.
Lightly season chickens with salt, pepper, and the minced herbs.
Place slices from 1 lemon, 4 garlic cloves, and the whole herbs in cavity of each hen.
Arrange slices from 1 lemon, sliced rounds of shallot or onion, and the remaining 4 garlic cloves in baking dish, roasting pan without rack, or dutch oven.
Roast for 25 minutes.
Reduce oven temperature to 350F.
Continue roasting about 25 minutes longer, or until hens are golden brown and juices run clear - and chicken's internal temperature is 170 degrees.
Remove hens from oven when they reach 170 degrees with an instant-read digital thermometer.
Tent hens with aluminum foil as hens carryover cook, do not carve for at least 10 minutes.
Serve individual chickens on diners' plates, and encourage them to carve table-side for a fun dinner!