Lemon Cake with brownies

2 box Passover Yellow Cake Mix 1 pkt Lemon Ko-Jel 3/4 c. Oil 4 x Large eggs , beaten 1/2 c. Water 1/4 c. Lemon juice 1 c. Confectioner's sugar 3 Tbsp. Lemon[...]

3 c. flour sifted 1 Tbsp. baking pwdr 1 tsp baking soda 1/2 tsp salt 1 c. unsalted butter room temperatureerature 2 c. granulated sugar 4 lrg Large eggs[...]