Grilled Tuna with Salmoriglio and New Potatoes

Salmoriglio is a Southern Italian herb sauce that goes well with grilled fish and meat. It is strongly flavoured and should be treated with respect. Use the best olive oil you can afford. I have made it with oregano here but you can also make a very flavourful thyme salmoriglio as long as you use young, green thyme that will crush to a paste easily.

When buying the tuna, make sure you get fresh, not frozen, loin and ask the fishmonger to slice if for you rather than bu