In a large bowl, combine the flour and butter. I usually put the stick of butter in the microwave for 15 seconds to make it softer. Using your hands, work the butter into the flour until the mixture looks like a bowl of tiny pebbles.
Add the eggs, and 3 tbsp of cold water. Work through the mixture with your hands. If the dough doesn’t seem to hold well, add another tbsp of cold water, although you do not want the dough to be sticky.
Add the salt and rosemary (or whichever spice you want to use) and work through the dough with your hands.
Split the dough in half to create two separate balls of dough.
Wrap in saran wrap and refrigerate immediately if the dough is not going to be used right away.