2 tablespoons minced shallots or scallions (white part only)
1 to 2 cloves garlic, mashed to a paste with 1/2 teaspoon salt
1 tablespoon minced fresh parsley
1 tablespoon fresh lemon juice (optional)
1 tablespoon minced celery (optional)
Salt and ground black pepper to taste
Roll the mixture into a cylinder in a piece of wax or parchment paper, plastic wrap, or aluminum foil (or shape as desired), and refrigerate or freeze until firm enough to slice. Or refrigerate in a small bowl or ramekin and spoon on just before serving.