Grilled and then tossed with a simple mustard vinaigrette, these vegetables turn tender and juicy, providing an ideal foil for the hearty grilled steaks.
Cooks' note:
•If you aren't able to grill outdoors, squash and/or zucchini can be cooked in a hot lightly oiled well-seasoned large (2-burner) ridged grill pan over moderately high heat, turning over occasionally, until just cooked through, 8 to 12 minutes total.
•If you are making this entire menu, grill squash and/or zucchini while steaks are standing.