1Vidalia onion, anywhere from 10-12 ounces (any sweet onion variety will do)
1scant cup mayonnaise
1scant cup sour cream
1/2cupshredded Grana Padano cheese, substitute good Parmesan or Romano
1cupshredded white cheddar cheese
lots of fresh cracked black pepper to taste
4dashes hot sauce
2dashes Worcestershire sauce
Set the oven to 375F
Peel and slice the onion in half. Then slice it in half again, and cut 3 of the sections into very fine slices. Take the last piece and mince it. Put the onion in a bowl with the rest of the ingredients and mix well until everything is thoroughly combined. Taste and adjust the seasonings to your liking.
Spoon the mixture into an ovenproof casserole and bake for 25 minutes until browned and bubbly.
While the dip is baking, slice a baguette and place the slices on a hot grill pan to toast them on both sides. Serve with the hot dip.