Fill a 9x13" cake pan about 1/3 full of water. Place wooden skewers in cake pan to soak. Set aside.

Prepare chicken by trimming off fat and cutting into cubes. Peel and devein shrimp.

In a bowl, combine lemon zest, lemon juice, olive oil, garlic, salt, pepper and oregano.

Pour out water in cake pan and thread chicken and shrimp onto soaked skewers. Tip: it's best to not mix the shrimp and chicken because the chicken will take longer than the shrimp to cook.

When all skewers are threaded, place inside cake pan and pour prepared marinade over the skewers. Cover and marinate in the refrigerator for up to 3 hours for the chicken (less time is best for the shrimp)

Preheat grill (or grill pan) to medium-high heat. Place chicken skewers on hot grill and cook for a few minutes, and then flip. Add shrimp skewers to grill and cook each side for a minute or two. Be careful to not overcook. Serve and enjoy!