The lemon curd and blueberry sauce can be made ahead and refrigerated for up to two days, but the lemon mousse should be prepared just before assembling. The cream puffs can be baked in advance and frozen for up to one month.
These easy, do-ahead puffs can go directly into the oven from the freezer. The same recipe can also be used to prepare eclairs, gougeres (puffs filled with cheese), and cream puffs.
From the book "Mad Hungry," by Lucinda Scala Quinn (Artisan Books).
This recipe makes enough for second helpings (about four and one-half dozen cream puffs). Unfilled puffs can be frozen up to one month. The filling can be refrigerated, covered, for two days, but don't add the whipped cream until just before piping it into the puffs.