Remove as much of the outer layers of the garlic that you can without breaking the whole garlic head apart.
Cut the top off the garlic head revealing the flesh of each garlic clove.
Drizzle with olive oil, wrap in foil and bake in a preheated oven at 400 for 30-40 minutes.
Check garlic head and remove from oven when every garlic clove is soft and golden.
Once garlic is completely roasted, remove from oven and allow to rest.
While garlic is roasting, place tomatoes in a bowl and cover with water.
Allow tomatoes to stand for 10 mins then drain, and pat dry with paper towel.
Place tomatoes, mayo, olive oil in blender and then squeeze roasted garlic in on top, then add a pinch of salt to taste.
Blend on medium setting, making sure to scrape in ingredients that collect on the sides.
Once the blended ingredients are of uniform consistency, it's ready for use.