Preparation in the summer: The night before your weekly pickup, rinse and spin dry your remaining cooking greens. I remove any large stems, but keep them if you like stems. (spinach, kale, chard, any leafy green will do.) Stuff them into a large ziplock bag and put them in the freezer for a few hours or even overnight, and then crush the frozen leaves and remove the excess air from the ziplock bag so it doesn't take so so much space in your freezer. Put it in the way back and forget about it till you get invited to a party and need something really nice to bring with you. 1) Mix in a large bowl 4 cups of frozen crushed greens, plus 1 pound of crumbled feta cheese. I like to add shredded parmesan or asiago cheese if I have some, especially if I happened to get the feta in 6 oz instead of 8 oz blocks. 2) Melt the butter and have a pastry brush ready, clear and clean a large area on your countertop or tabletop to work. (once you open the fillo dough, you need to work fast since it dries out.) For 2 9x12 pie: have 2 9x12 pans ready. For triangles: have a large sharp knife and a cookie tray ready. no need to oil or butter pans 3) For two 9x12 pies: Layer 10 sheets of fillo with butter in the bottom of the pan. In other words, lay one sheet down, brush with butter, lay the next sheet down, brush with butter till you have 10 buttered sheets of fillo. Put half of your total amount of greens/cheese filing on top of those layers, then layer 10 more sheets of fillo with butter on top of that. Brush any excess butter on the tops of the finished pies. Bake for 30-45 minutes at 350-375F. 4) For triangles, layer 4 fillo sheets with butter on top of a large cutting board. Cut the 4-layer sheet longways in two long strips, and place a large spoonful of filling at one end. Fold into a triangle and place on the cookie tray. It's good to have a partner for this part, someone who can handle the butter while you handle the filo or vice versa. Try to do this part fast so the dough will not dry out. Brush any excess butter on the tops of the finished triangles. bake for 15-30 minutes 350-375F. If you need to see how to fold it into triangles, check out
http://www.athens.com/recipes/triangleshapes2.html