VINCE'S HAM-AND-CHEESE CROQUETTES

Steps:

• Melt the butter in a small saucepan over medium heat. Add the onion; cook until soft, about 5 minutes. Add 1/2 cup flour, the cayenne pepper and 1/2 teaspoon salt; cook, stirring with a wooden spoon to make a dry, stiff mixture, about 3 minutes. Gradually whisk in the milk to make a smooth paste. Stir until the batter forms a ball, about 3 more minutes.
• Remove from the heat; stir in the ham, cheese and thyme. Spread the mixture evenly into a greased 8-inch square baking pan. Cool, then refrigerate until firm, at least 45 minutes and up to 1 day.
• Meanwhile, make the pea sauce: Bring 3 cups water and the garlic to a boil in a saucepan. Add the peas; cook until thawed, 30 seconds. Drain, then transfer the peas and garlic to a blender. Add the broth and lemon zest; puree until smooth. Season with salt and pepper and set aside.
• Heat about 3 inches of oil to 340 degrees in a saucepan over medium-high heat. Place the remaining 1/4 cup flour, the eggs and the saltine crumbs in 3 separate shallow dishes. Cut the chilled dough into 20 4-inch-long croquettes. Dredge each in flour, then dip in the eggs, letting the excess drip off, and roll in the saltines.
• Fry the croquettes in the oil in batches until golden brown. Drain on a paper-towel-lined plate. Season with salt and serve with the pea sauce.