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1
Prepare the sauce first.
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2
Place the peppers and garlic on a sheet of foil on an oven tray and place under a preheated broiler, 2 1/2 to 6 1/2 inches from the broiler.
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3
Turn the peppers until their skins are black and blistered all over.
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4
Remove the garlic when it feels soft.
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5
Alternativelyand more easilyroast both the peppers and garlic in the hottest oven for about 30 minutes (take out the garlic much sooner, when it feels soft), or until the peppers are soft and their skins blistered and blackened, turning them once after 15 minutes.
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6
To loosen their skins further, put the peppers in a strong plastic bag, twist it shut, and leave for 10 to 15 minutes.
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7
Another old way that has the same effect is to put them in a pan with a tight-fitting lid for the same length of time.
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8
When the peppers are cool enough to handle, peel them and remove and discard the stems and seeds.
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9
Peel the roasted garlic cloves.
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10
Blend the roasted peppers and garlic in a food processor with the rest of the sauce ingredients.
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11
Heat the oil in a large, preferably nonstick, skillet.
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12
Put in the tuna steaks and cook over high heat for less than 1 minute on each side, sprinkling lightly with salt.
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13
The time depends on the thickness of the piece.
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14
Cut into a steak with a pointed knife to test it; it should be soft and still pink inside.
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15
Serve the tuna steaks on top of the sauce, sprinkled with the chopped parsley.
