Grandma B’s Chocolate Beet Cake

1-1/2 cup white sugar
1 cup vegetable oil
3 eggs
1-1/2 cups pureed, cooked beets or a pint of canned beets put through a blender or shredded
2 - 1 ounce squares unsweetened chocolate melted
1 teaspoon vanilla
1-3/4 cups flour
1-1/2 teaspoon baking soda
½ teaspoon salt
Beat sugar, oil and eggs at medium speed with an electric mixer for 2 minutes. Mix in beets, melted chocolate and vanilla. Sift together flour, baking soda and salt. Gradually add dry mixture to chocolate mixture, beating until smooth. Turn into greased and floured 13x9x2 pan for 35 to 40 minutes until cake tests as done.