I love desserts like this for many reasons; they are comforting, beautiful and everything can be assembled well in advance for ease of serving. You can make the streusel whenever you want and freeze it until you are ready to use it. The lemon custard should be made the day before you are planning to serve the desserts and the blueberry mixture right before assembling them-- it spreads out better if it slightly warm. This is a marriage of two different Fine Cooking recipes. For the Streusel : 2/3 cup flour 1/2 cup oats 6 T unsalted butter, cut into cubes 1/2 cup slivered almonds or walnuts 1/4 cup brown sugar 1/4 cup sugar 1/4 t kosher salt Pulse all the ingredients in a food processor until crumbly. Spread the streusel on a rimmed baking sheet and bake at 325ยบ for about 20 minutes, stirring it every 5 minutes (until golden- don't overbake). Set aside to cool For the Lemon Custard : 3 egg yolks 3 T sugar 1 cup heavy cream (although I'm going to try this with w...