Step 1Heat the oven to 325 degrees. Grease the bottom and sides of a 9-by-13-inch pan.
Step 2Beat the margarine and egg yolks in the bowl of an electric mixer. Add the salt, sugar, matzo cake meal, lemon zest and vanilla and mix thoroughly. The mixture will be crumbly. Pat three-fourths of the dough into the bottom of the pan; refrigerate the remaining dough.
Step 3Bake the crust until firm, 20 minutes.
Step 4Mix the preserves and lemon juice and spread evenly over the slightly cooled crust. Sprinkle the nuts and the crumbled remaining dough on top. Bake until the topping is golden brown, 30 to 35 minutes. Cool and cut into squares.