Special equipment: Eight 10-inch wooden skewers, soaked in water for 30 minutes
Once your meat and veggies have been prepped let the skewering fun begin! Thread a piece of green pepper onto the skewer. Follow it with a cube of beef, then one half of a preserved lemon, a couple of pieces of red onion, another piece of beef, a piece of red pepper and cap it with a mushroom. Repeat the process with the rest of the skewers. Set all of the kabobs into a roasting pan in one layer and set aside.
Place the remaining ingredients in a medium sized bowl and whisk until well incorporated. Pour the mixture over the kabobs and refrigerate 1 hour.
Preheat an outdoor charcoal or gas grill to high heat. Place the kabobs on the grill and cook 3 minutes per side. Remove and serve immediately or let cool, pack 'em up and take them on a picnic.
Serve with Cucumber-Yogurt Sauce.
Combine all ingredients in a food processor and pulse several times to make a chunky sauce.
Preserved lemons can be found in specialty food stores and Middle Eastern markets