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1
Put the potatoes in a 4-quart pot and cover with cold water.
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2
Simmer gently until tender, about 25 minutes, being careful not to overcook them.
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3
Meanwhile, prepare the grill, adjusting the rack 2 inches above the coals.
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4
Trim the tuna, discarding the skin and any dark purple flesh.
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5
Refrigerate.
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6
Cut the roasted peppers lengthwise into 1/4-inch-wide strips.
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7
Put in a bowl and toss with 1 tablespoon of the olive oil.
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8
Season with salt and pepper and set aside.
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9
Drain the potatoes and peel while still hot.
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10
Slice into 1/4-inch rounds and arrange 1/4 of them in a pie plate or casserole.
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11
Sprinkle with 1/4 of the shallots, 1/4 of the parsley and salt and pepper.
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12
Repeat the layers until all the potatoes are used.
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13
Whisk 2 teaspoons of the vinegar with 1 tablespoon of the oil and pour over the top.
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14
Lightly rub the tuna steaks with 1 tablespoon of the olive oil and season with salt and pepper.
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15
Grill until charred on the outside and rare in the center, about 2 minutes per side.
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16
Place the greens in a large salad bowl and top with the potato mixture, the peppers and the tomatoes.
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17
Slice the tuna into 1/4-inch strips and arrange on top of the salad.
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18
Just before serving, make a vinaigrette from the remaining vinegar and oil and pour over the salad.
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19
Season with salt and pepper.
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20
Taste and toss with more vinegar or oil if needed.
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21
Serve immediately.