Спасибо за интерес. Вот ещё одно описание того, что делают с барашком:

There is still an "ijslam" or “ice lamb”: a cake topped by a spotless little lamb made of vanilla ice cream. The communicant is invited to stand in front of it and is solemnly handed a large, sharp knife. Wielding the knife with more or less dexterity, this seven-year-old proceeds to saw off the lamb’s head! His or her effort is rewarded when the head rolls onto the platter and red syrup (grenadine) oozes out of the neck.

http://customsholidays.suite101.com/article.cfm/firstcommunionfood