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Do you have a coal barbecue? Heat it up before preparing, so the coals are nice and white-hot. PEEL the red onion and slice into wedges. RINSE the cherry tomatoes, zucchini and yellow squash.
CUT the yellow squash into bite-size pieces and the zucchini into not too thin long strips. CLEAN the mushrooms with a paper kitchen towel or use a mushroom brush. That's all for the preparation, all you have to do now is get them all on the wooden skewers.
The order of the veggies doesn't really matter, get them on the wooden skewers any way you like. The zucchini strips are easier than they might look, you fold them sort of like a fan and then pierce them onto the skewers.
DRIZZLE the vegetable kebabs with lemon juice and olive oil. Season with pepper and salt. GRILL the kebabs on the barbecue for a few minutes on each side, they'll need no longer than 5 minutes!
Chop up the basil leaves and garnish with basil and lemon wedges, enjoy!