Spleen - yum!
The Japanese have the right idea of using everything but the beak when it comes to chicken. A yakitori bar I went to had the following skewers available:
"Roasted Giblets:
Tan (pork Tongue)
Hatsu (Heart)
Reba (Liver)
Shikin (Gullet)
Nankotsu (Throat)
Chire (Spleen)
Teppo (Archo)
Shiro (Large Bowel)
Gatsu (Stomach)
Komekami (Head Meat)
Harami (Diaphragm)
Kobukuro (Uterus)
Leg
Breast Meat "
I tried a few, all good, but balked at the chicken sashimi. Finally tried that on my last trip, very good indeed! (they pasteurise it so no worries about bacteria)