Ingredients:

  Amount  Measure       Ingredient -- Preparation Method
--------  ------------  --------------------------------
   1      large         garlic clove
   2      tablespoons   fresh lemon juice
   1      teaspoon      white-wine vinegar
     1/4  cup           vegetable oil
   2                    zucchini -- (1 1/2" dia)
                        scrubbed

Preparation:

Mince and mash the garlic to a paste with 1/2 teaspoon salt. In a small bowl whisk together the garlic paste, the lemon juice, the vinegar, and pepper to taste and whisk in the oil. In a shallow baking dish large enough to hold the zucchini in one layer combine the zucchini, halved lengthwise, and the marinade and let the zucchini marinate, covered and chilled, turning them several times, overnight. Grill the zucchini on an oiled rack set 5 to 6 inches over glowing coals for 8 minutes and brush them with some of the marinade. Turn the zucchini, grill them for 6 to 8 minutes, or until they are tender, and transfer them to a work surface. (Alternatively the zucchini may be grilled in a ridged grill pan.) Slice the zucchini diagonally.