I’d take a head or two of garlic, cut the top off to expose the cloves, put a little olive oil on it, wrap it in foil, roast it 20 minutes at 350 until soft, and I’d squeeze the roasted garlic out into a bowl with some mayonnaise. Mix well.
It may be different than the type of garlic dip they sell in the stores, but I frequently have roasted garlic with hallah, and it’s delicious.
For whatever it’s worth, I even read that there’s a minhag among some Hasidim to have garlic cloves and olive oil on shabbat.