Pot-Roasted Partridge With Sage

Ingredients

• 4 partridges
• 15 g fresh sage
• 1 tablespoon butter
• 1 tablespoon extra-virgin olive oil
• 1 onion, finely chopped
• 1 tablespoon all-purpose flour
• 1 1/4 cups hard cider or apple juice
• 1/2 cup chicken stock, preferably homemade
• 2 teaspoons German or whole-grain mustard
• 3 walnut halves, thinly sliced
• 1 red-skinned dessert apple, cored and cut into thick slices
• Salt and fresh-ground black pepper