COOKING INSTRUCTIONS Preheat oven to 450°F/232°C.
Place marrow bones in a roasting pan, wider side down if they are uncut. If they are cut, cut side up.
Roast bones until marrow is soft but before it begins to melt, about 15 to 20 minutes.
Meanwhile prepare the salad, tossing the arugula, parsley, shallot, cucumber, tomatoes, lemon juice and olive oil.
Sprinkle with fresh sea salt and pepper.
Divide marrow bones among 4 plates, and serve with a side of salad. Use a long, thin spoon to scoop the marrow out if it is not center cut.