Roasted Garlic without stock back

4 large garlic bulbs, tops removed 3 Tbsp. good quality olive oil 2/3 cup onion , finely chopped 2 Tbsp flour 3 cups peeled and diced potatoes 1 1/4 cups[...]

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[...]