Ingredients:
1 pound fresh tuna filet (such s albacore)
2 1/2 cups extra-virgin olive oil; more if needed to cover the fish during cooking
1/4 cup fresh lemon juice
Kosher salt and freshly ground black pepper
1 14-ounce can water-packed artichoke hearts, drained, rinsed, and coarsely chopped
2 tablespoons drained nonpareil capers, rinsed
12 slices sourdough bread, lightly toasted
1 ripe heirloom slicing tomato, cut into 6 slices
6 leaves lettuce (such as romaine, red leaf, or Boston), washed and dried

Instructions:
Cut the tuna into even 3- to 4-inch pieces. In a deep saucepan, wide enough to hold a few tuna pieces without crowding and deep enough to contain the poaching oil without spilling when the tuna is submerged, heat the olive oil over medium heat until an instant-read thermometer inserted into the oil reaches 190°F. The oil should stay at or near this temperature during the cooking process, so you'll need to monitor and adjust the intensity of the heat under the pan.

Rub the tuna with 1 tablespoon of the lemon juice and season with salt and pepper. Carefully submerge as many pieces of the tuna as will fit in a single layer in the hot oil. The oil must cover the tuna, so add more oil if needed. Cook until the tuna turns pinkish gray on the outside and is slightly pink in the center (remove a piece of tuna with a slotted spatula or spoon and cut into it to check), 3 to 6 minutes. Remove the tuna from the oil and set on a platter to cool. Repeat the process as necessary to cook the remaining tuna. Don't discard the poaching oil yet.

When the tuna is cool enough to handle, break it into small chunks over a medium bowl. Add the artichokes, capers, 1/4 cup of the poaching oil, and the remaining 3 tablespoons lemon juice. (Discard the remaining poaching oil.) Season with 1 teaspoon salt and several grinds of pepper or to taste. Toss gently and let the tuna salad sit for 10 minutes at room temperature or overnight in the refrigerator. Before serving, bring to room temperature and check the seasonings.

Right before you leave for the picnic, or when you reach your picnic destination, layer a lettuce leaf, a tomato slice, and about a sixth of the tuna salad between two slices of toast (or use less if a sixth of the salad seems like too much for the size of your bread slices). Repeat to make six sandwiches. Wrap well in plastic for transport or serve immediately.

No of Servings:
six sandwiches