Whisk together 1 tablespoon Italian seasoning, 1 teaspoon salt, ½ teaspoon black pepper, ½ teaspoon garlic powder, 2 tablespoons olive oil, and the juice from 1 lemon in a medium bowl. Cut 3 pounds pork tenderloin into approximately 2-inch pieces and place them in the bowl with the marinade. Toss to coat evenly. Cover and refrigerate for at least 1 hour or up to 4 hours.
While the pork marinates, cut 1 large red onion and 2 large red bell peppers into 2-inch pieces. Slice 2 zucchinis into 1-inch thick slices. Also, soak the wooden skewers in water for at least 30 minutes to prevent them from burning while grilling.
Skewer the marinaded pork and vegetables onto the wooden skewers. Then preheat a grill over medium high heat (approximately 400 degrees F).
Place the kabobs on the hot grill and cook for approximately 6-8 minutes (until the pork reaches an internal temperature of 145 degrees F and the vegetables are tender) turning the kabobs approximately every 2 minutes to prevent them from burning.
Carefully remove from the grill and serve immediately.
Notes
We use an instant read meat thermometer to ensure that the pork is cooked to a save temperature.
Use tongs when flipping the kabobs or carefully roll them on the grill when turning them.