Pre-heat oven to 350° and select a pair of cookie sheets for baking.
Mix together eggs, sugar, oil, anise, and salt. Sift flour and baking powder together and add the dry ingredients to the wet mixture. Blend until a soft dough is formed.
Pinch off walnut-sized pieces of dough. Roll between fingers to lengthen, and tie each into a knot.
Continue pinching, rolling, and knotting dough for each cookie (If the dough becomes a bit sticky, simply keep your fingers well-dusted with flour).
Bake for about 12 minutes, or until cookies are light brown in color.
Remove from oven and sprinkle with powdered sugar. Store in an airtight container.