large egg plus 1 large egg yolk • pecorino Romano cheese, finely grated (1/2 cup) • parmigiano reggiano cheese, finely grated (1/2 cup) • grated lemon zest • kosher salt and ground black pepper • EXTRA-VIRGIN OLIVE OIL, DIVIDED • LARGE GARLIC CLOVES, SMASHED AND PEELED • SMALL TO MEDIUM ZUCCHINI, TRIMMED AND SLICED INTO ¼-INCH ROUNDS • RED PEPPER FLAKES • RIGATONI, MEZZI RIGATONI OR ZITI