Preheat your grill to medium-high heat, around 400°F. Allow about 10-15 minutes for the grill to reach the desired temperature.

Using a mandoline slicer or a sharp knife, slice the zucchini and summer squash into 1/8 inch ribbons.

In a large bowl, toss the zucchini ribbons with olive oil, lemon juice, salt, and pepper.

Thread the coated zucchini and summer squash ribbons onto skewers, weaving them with optional veggies for extra color.

Place the assembled skewers on the grill and cook for about 10-12 minutes, turning occasionally.

Once grilled, remove the skewers from the grill and sprinkle with grated parmesan cheese while they’re still hot.