Pre-heat the oven to 275 degrees F and line a baking sheet with parchment paper.
In a large bowl, whisk the egg whites until frothy.
Add the butter, sugar and spices and lemon juice and whisk to combine. The mixture should be pretty thick.
Add in the matzah pieces and nuts and coat carefully, making sure not to break up the pieces too much more.
Spread the matzah and nuts into one layer on the baking sheet. Bake 30-40 minutes until crunchy and dry, mixing often. Store in an airtight container at room temperature for up to 3 days.