Preheat oven to 350F. Pudding: In bowl, whisk together flour, sugar, baking powder, baking soda and salt. Stir in rhubarb & raisins. In separate bowl, beat together milk, egg and vanilla just enough to combine; stir into flour mixture. Turn batter into greased 8" square baking dish. Sauce: In boiling water, stir sugar and butter till sugar dissolves and butter melts. Add lemon juice, rind and nutmeg. Pour gently over batter. Bake at 350F for 30-35 minutes till pudding is golden brown on top and centre is firm to touch. Serves: 6