Combine sherry, soy sauce, oil, garlic, green onion, and ginger in a 1 gallon zipper bag.
Squish to combine.
Add meat, peppers, and onion.
Refrigerate at least 1 hour, overnight is better.
Soak bamboo skewers, or use metal ones.
Preheat grill to medium high heat.
Alternate skewering meat and veggies until all ingredients are used up.
Place kabobs on grill, turning every two minutes to desired doneness.
FYI - the peppers and onions will remain crisp tender. If you leave the kabobs on until the veggies are soft, your meat will be way overdone! If you prefer softer grilled veggies, make separate kabobs for meat and veggies so the veggies can cook longer.
Also, if you want your beef medium rare, make separate kabobs for the beef and the chicken. Be creative!