Boil 2 pots of water. One for the hard-boiled eggs and one for the baby potatoes. I cooked 3 eggs for 8 minutes to get a medium plus temperature on the yolk. Drain water and set aside.
I cooked my baby potatoes until they were fork tender. This will vary depending on how many potatoes you want to add.
Once cooked add them to a mixing bowl with the butter and spices. (garlic, parsley, oregano) Toss the potatoes until they are well coated. Set aside.
Preheat the grill to 400 degrees. Be sure to wipe the racks with olive oil to help prevent the tuna steak and romaine lettuce from sticking.
Cut the romaine heads in half. Drizzle with olive oil.
At the same time, you will prepare your tuna. You will want to put the tuna and the letyuce on the grill at the same time.
Pat dry the tuna using a paper towel. Removing the moisture helps prevent the tuna from overcooking. Water can transfer heat which will cause the tuna to cook too fast. Drizzle the tuna with olive oil on both sides. Making sure it is well coated.
Place the lettuce center side down on the grill. Also place the tuna down.
The tuna will only need to cook for about 2 minutes on each side. Use a metal grill spatula to turn.
Once cooked remove the tuna and romaine from the grill.