Storage: Fresh pasta dough can be kept in the refrigerator for up to 3 days wrapped tightly in plastic. It can also be frozen for up to 2 months. Let it thaw completely before rolling.
Substitutions: For a lighter green color, use arugula or basil instead of spinach. For a deeper red, use more beet puree or add a drop of red food coloring if natural color isn't vibrant enough.
Tips: When using wet ingredients like beet or spinach puree, reduce the amount of eggs slightly or add more flour to maintain the right dough consistency. The dough should feel like the tip of your nose: soft but firm.
Variations: Try adding a small amount of black pepper to the flour for "pepper pasta" or cocoa powder for a brown dough.