For the adventurous cook, squab is dark and richly flavored, while also tender and delicate to eat. Chef Keller makes squab with a savory veal filling and aromatic sauce. Dessert is a heavenly tartlet, perfumed with orange and lavender. Marinated Squab Breasts en Crepinettes with Juniper and Red Wine Sauce; Orange Tartlets with Lavender Meringue.