Fried Garlic Mashed Potatoes with Mushroom Picadillo Gravy

Ingredients

• 4 pound Yukon Gold potatoes, skins pricked with fork
• 4 cup whole milk
• 2 sticks unsalted butter
• 2 teaspoon black peppercorns, lightly crushed
• 2 fresh bay leaves
• 2 heads garlic, 1 cut half crosswise and 1 head separated into cloves, peeled, and thinly sliced crosswise
• coarse kosher salt
• neutral cooking oil
• 8 ounce portobello mushrooms
• 4 tablespoon butter
• ¼ yellow onion, peeled and finely diced
• 1 carrot, finely diced
• ¼ tsp red pepper flake
• 2 teaspoon flour
• 1 8-oz can tomato sauce
• 1 tablespoon soy sauce
• 1 teaspoon maple syrup
• 3 tablespoon raisins
• ⅓ cup frozen green peas
• ¼ cup pitted green olives, diced
• coarse kosher salt and ground black pepper