Spicy Lemon Date Bars

This is very good and came from grandma.

1 package spice cake mix
¼ cup water
2 eggs
¼ cup margarine
¼ cup brown sugar (packed)
1 ½ cup chopped dates
½ cup chopped nuts

Combine half the dry cake mix, water, eggs, margarine and brown sugar in a bowl. Mix well. Blend in the remaining cake mix. Stir in dates and nuts. Spread in greased and floured 15 1/2 x10 1/2 –inch jelly roll pan. Bake at 375 degrees for about 18 minutes. Spread on glaze while warm.
Glaze:
1 cup powdered sugar
½ tsp. Grated lemon peel
1 tsp. Lemon juice
2 Tbls. milk
Combine all ingredients and beat till smooth.