Roasted Garlic without root

1/4 cup olive oil 20 bulbs garlic (or as little "or" as much as you want) 1 lb white pearl onion (optional) salt and pepper 2 four inch sprigs rosemary ,[...]

4 Tbsp. butter 2 Tbsp. Peeled and finely minced Vidalia onion or possibly sweet onion 2 x heads roasted garlic or possibly 8 or possibly 10 cloves fresh[...]