Preheat oven to 200°C.
Drain bone marrow and pat dry with paper towel. Use a boning knife to remove as much sinew from the bones as possible. Place on a baking tray, drizzle with olive oil, season with salt and pepper, and sprinkle thyme sprigs on top. Roast for about 12 minutes.
For the mushrooms, heat a frying pan until hot. Add oil and butter, then brown the mushrooms for about two minutes, taking care not to stir the pan too much.
In a small baking tray, toast walnuts in the oven for about 3 minutes.
Arrange bone marrows on a board, sprinkle mushrooms and walnuts over, and serve with lime wedges and ciabatta toast.
For more meaty recipes that pair well with a glass of Nederburg’s Motorcycle Marvel red blend, such as smoky BBQ kebabs, visit the Nederburg page.