Oysters Rockefeller

Ingredients
24 fresh oysters
1 cup of Marston's Oyster Stout
1 clove of garlic
3 black peppercorns
¾ cup of butter
½ onion, chopped
1 clove of crushed garlic
5 ounces of frozen chopped spinach, thawed and drained
4 ounces of Monterey Jack Cheese, shredded
4 ounces of Fontina cheese, shredded
4 ounces of mozzarella cheese, shredded
¼ cup of milk
2 teaspoons of salt
1 teaspoon of ground black pepper
1 tablespoon of fine bread crumbs
Preparation
1. Clean the oysters from any filth and grim and place them in a large pot. Pour the beer into the pot and also enough water to cover all the oysters. This is to make sure that the taste of the beer can get into all of the oysters. Add also a clove of garlic, peppercorns and seasoning salt, if needed. Heat them until boiling temperature. Boil them for around five minutes and remove the oysters from the pot afterwards and drain them from the liquid.
2. After around ten to fifteen minute, break the shells of the now-cooled oysters and discard only the top shell. Arrange them on a baking sheet and preheat the oven to around 400 degrees Fahrenheit.
3. Melt butter inside a frying pan over medium heat to prevent ingredients from sticking to the pan's surface. Cook onion and garlic in butter until soft but not burnt, reduce heat level to low and put in spinach into the mix. Stir them gently and little by little, pour in the three different types of cheese. Cook the mixture until the cheese melts completely and keep stirring so that the cheese will be spread nicely all over the spinach.
4. Add milk and enough salt and pepper for taste and stir the mix until it becomes like a sauce. The sauce is then spread over each oyster but not too much; just filling the shell. This is to prevent them from falling over the oyster during the baking process. Sprinkle bread crumbs onto each oyster to have a crispy yet tender taste to the oyster.
5. Bake the oysters until golden and bubbly which is around 8 to 10 minutes at 425 degrees Fahrenheit. This dish is best eaten accompanied with Filthy Martini or Lemonade that can refresh your taste buds to consume more and more of these delicious oysters.