Tuna Poached in Olive Oil: Cut 1 pound of boneless fresh tuna in large chunks and coat with 1 teaspoon sea salt or kosher salt. Pack tightly in a medium saucepan or small skillet. Add1 rosemary sprig, 1 garlic clove, several peppercorns, a bay leaf and olive oil to cover (about 1 cup). Bring to a simmer over low heat and cook very gently until just cooked through, about 10 minutes. Cool. Transfer the pan contents to a ceramic container or glass jar. Refrigerate for up to a week. To use the tuna, break into smaller pieces. When it’s all gone, discard the oil.