For roasted garlic, cut off garlic heads to expose the cloves. Drizzle 1/2 tablespoon olive oil over each head and sprinkle with black pepper.
Add 1/2 inch water to a pan, and place garlic in it. Bring to a boil on top of stove, then place in oven for 45 minutes. Cool and push through a sieve.
Peel potatoes and cook covered in water until they can be broken apart with a fork.
Mash potatoes and add all ingredients, including heads of roasted garlic. Combine well. Serve with butter, or gravy.