make a smaller rectangle. place 1½ tablespoons of the spinach mixture in the bottom of one of the rectangles. fold one corner of the rectangle over the spinach filling to make a triangle. fold this triangle over itself toward the top—as you would fold a flag—and continue folding up until triangle is produced. brush this all over with butter and put on the baking sheet. continue making triangles until all the spinach filling is used.
bake the triangles for about 20 minutes, or until puffed and golden brown. serve warm. 