Crusty Rhubarb Cake

1 1/2 c sugar

1/2 c butter

1 egg

1 tsp baking soda

1 c milk + 1 T lemon juice

2 c chopped rhubarb

1 tsp vanilla

1 tsp salt

2 c flour

Mix until smooth, pour into a 9x13 pan.  Top with:

1/2 c butter

1/2 c brown sugar

1/2 c quick oats

1/2 t cinnamon

Blended well.

Bake 350 x 50 minutes.