Zippy Salsa Tonnato Cold Tuna Sauce

Ingredients

• 3 tablespoons olive oil
• 3 tablespoons unsalted butter, divided
• 1 small yellow onion, finely chopped
• 1 small fennel bulb, trimmed, cored, and diced
• 4 or 5 (1 small handful) spring radishes, trimmed and diced
• 1/2 teaspoon hot pepper flakes (or more to taste)
• 4 garlic cloves, minced
• 6 anchovy fillets
• 6- to 8- ounces can (or jar) good-quality tuna in olive oil, drained and chopped, oil reserved
• 1/2 cup dry white wine
• 1/4 cup capers, drained and rinsed
• 1/4 cup Italian parsley leaves, finely chopped, plus extra for garnish
• 1/2 cup mayonnaise or aioli
• 2 to 4 tablespoons red wine vinegar or lemon juice (start with 2 and adjust from there—I prefer more tang)
• 2 to 4 tablespoons water
• Salt and freshly ground pepper, to taste

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