Organic farming working and learning, more than 100 farms available in Portugal subscription costs only 15 euros! You only need to buy yourself your travel tickets ... all the food (and accommodation of course) will be provided by your Host!
WWOOF is a way to make friends with the local people, and exchange your own cultural values with them.
Hosts give WWOOFers meals, accommodation and social engagement, in return for which WWOOFers help Hosts with what they do at their place.
It's simple. You give what you have, and you receive what you don't have.