Gritty / Sandy Mouthfeel
"The dessert feels grainy on the tongue."
1The Technical Cause
This is usually caused by "Almond Meal" (ground with skins) instead of "Blanched Super-Fine Almond Flour", or by undissolved granulated sugar.
2The Professional Fix
Switch to a blanched, super-fine almond flour. Sift your flour twice before measuring to ensure no large particles remain.