Well I came across this recipe, and I just had to try it. It is a Cuban recipe and it seemed crazy, but it worked out great. It is an empanada dough made with yucca root. Follow me so you can see how it's done.
1 lb yuca
3/4 cup all purpose flour
1 egg yolk
1 tbsp butter or margarine
1 tsp salt
If using fresh yucca, peel, and cut into chunks. I used frozen yucca which is easier to find here. Boil your yucca until tender. Strain and remove hard root center. While still warm pass through a food processor to form a paste. In a large bowl combine your yucca paste with the butter, salt and egg yolk. Using your hands slowly work in the 3/4 cup of flour. Cover with plastic wrap and refrigerate to cool. (I left it in overnight until I was ready to prepare my empanadas).
Liberally flour a working surface and separate a small ball of dough and place onto your surface. The dough may be sticky, so make sure you have flour to sprinkle on as necessary. Roll out your dough, removing any hard pieces that may be left behind. Use a bowl to form circles on your dough, trace around the bowl with a knife. Place your filling in the center and fold in half. Crimp the edges up with your fingers to seal. You can fry your empanadas in vegetable oil, turning to brown evenly or brush on an egg wash on the tops and bake in a 350 degree oven until golden. (I preferred the baked ones)
These may be filled with whatever you desire ... meat, chicken, cheese, etc. I made a simple spinach filling using chopped onions, garlic, canned spinach and feta cheese.
Sautee your onion and garlic in olive oil and add your drained spinach. Cook on low heat 'til the liquid has been absorbed. Season with salt and pepper to taste. If necessary strain your spinach filling to release as much liquid as possible.