Grilled Tuna with Citrus Shallot Vinaigrette

The move that lifts this dish above a basic grilled tuna steak is the julienned citrus peel blanched for thirty seconds before it hits the vinaigrette. That quick plunge in boiling water tames the bitter oils in the zest while keeping the aromatic ones intact, leaving behind delicate ribbons of lemon and lime that perfume the sauce without dominating it.

Shallots macerate in the lemon and lime juice while the tuna grills, which softens their bite and pulls all the flavors together. Rice vinegar is the other quiet choice here, less harsh than red wine or cider vinegar and with a gentle sweetness that keeps the vinaigrette light.

Tuna steaks are unforgiving on the grill. Two to three minutes per side over a hot fire leaves the interior a beautiful rosy pink. One minute longer and the texture turns chalky and dry. Basting with a spoonful of vinaigrette during the grill keeps the exterior from drying and adds a subtle caramelized char.

Pro Tips

• Use a swivel peeler and work gently to take only the colored zest; the white pith underneath turns the vinaigrette bitter
• Bring the tuna to room temperature before grilling so the outside sears while the inside stays medium-rare
• Preheat the grill grates until screaming hot and oil them well, cold grates mean stuck fish
• Let the finished tuna rest one minute before serving so the juices redistribute; use this time to spoon the remaining vinaigrette over the top

Variations

• Swap rice vinegar for champagne vinegar for a more French-leaning profile
• Add a teaspoon of grated ginger for an Asian-style bite
• Use the same vinaigrette over grilled swordfish, salmon, or even grilled chicken breast