Back when i was a kid "Farm hand". We would go collect branches on the ground and create a big pile of sticks as fuel for the cooking pot near the pig pens. Its basically a big cauldron where we would pour 1/2 pig feed + 1/4 food scraps + 1/4 Kangkong (Water Spinach).
This would fill up the pigs quite nicely, elimate pest or contaminants and reduce feed cost.