Sparkling - Tartine's Bread Pudding - Belden Barns

Ingredients

• 1 tablespoon unsalted butter
• 2 leeks, white parts only, finely chopped (use 1/2 cup onions if you can't source leeks)
• 1/2 cup dry white wine
• Olive oil
• 2 pounds assorted mushrooms, stems trimmed and caps halved
• 1 head Treviso or other radicchio, leaves separated (spinach works too)
• 5 large eggs
• 1/2 teaspoon salt
• 1 cup heavy cream
• 1 cup whole milk
• 1/4 teaspoon freshly ground pepper
• 1/4 teaspoon freshly ground nutmeg
• 2 teaspoons fresh thyme leaves
• 2/3 cup plus 1/2 cup grated Gruyère or cheddar cheese
• 3 ounces smoked ham, chopped (we've used sweet sausage successfully)
• 2 slices day-old Basic Country Bread, torn into large chunks