Firstly this calls for you to have some roasted garlic handy.
Preheat your oven to 200°. Place the full heads of garlic in a small baking dish. Roast in the oven until they are golden, very soft and the tops have begun to bubble. This will take about 45 minutes or and hour. Let cool slightly.
In a pan, put in a stick of butter and the white button mushrooms which have been sliced. Fry till golden brown.
Then toss in a couple of diced sun-dried tomatoes.
Slice the top off the roast garlic with a serrated knife and squeeze in the roasted garlic, holding onto the root end bottom and letting the softened garlic ooze out of the top. Season with salt and pepper and mix well.