For an even more intense Meyer lemon flavor, zest the lemons directly into the sauce while it simmers. Feel free to substitute regular lemons if Meyer lemons are not available, but be sure to taste and adjust the sugar accordingly, as regular lemons are more tart. The bundles can be assembled ahead of time and stored in the refrigerator, covered, for up to 4 hours before baking. Add a few extra minutes to the baking time if starting from cold.