Prepare your mise en place.
Wrap the coriander seeds and peppercorns in cheesecloth and tie as for bouquet garni. Set aside.
Leaving the zucchini skin on, trim both ends and, using a chef’s knife, either slice crosswise into 2.5-centimeter (1-inch) lengths and tournée, or cut the zucchini lengthwise into equal pieces. Set aside.
Heat the olive oil in