Step 1

Set up a grill for cooking with indirect heat. If using a charcoal grill, build the coals on one side only. If using a gas grill, heat one side only.

Step 2

Place the potatoes in a cast-iron pan. In a mixing bowl, whisk together the lemon zest and juice, olive oil, mustard, garlic, oregano, a pinch of salt, some black pepper and 2 cups water. Pour the mixture over the potatoes and toss to combine. Turn the potatoes so they are cut-side down in the pan.

Step 3

Place the pan on the indirect-heat side of the grill, then close the lid and bake until the potatoes are tender, about 40 minutes. Remove from the grill and serve with a squeeze of lemon, a sprinkle of sea salt and a drizzle of olive oil.