I don't know of any charity that offers a similar thing to Irish people as the cows/goats/pigs etc for families in Africa, but maybe you could look out for food appeals? I did a quick search on Google, pages from Ireland only, using the phrase "Christmas food appeal 2009" and found various places around the country that are conducting food collections. You could make a food donation to one of these, then type up a certificate yourself to hand to the people on whose behalf you have donated the food.