Preheat oven to 350F degrees, and adjust a rack to the center of the oven. Lightly spray an 8" cake pan, and line bottom with parchment round.
In medium bowl, whisk together flour, and spices. Set aside.
In another medium bowl, crack egg and give it a bit of a whisk. Add sugar and vegetable oil, and whisk together.
Pour tomato soup into a bowl or a quart container (or any container slightly larger than it's can.) Whisk in 1 tsp baking soda. Mixture will start foaming and grow in volume. Whisk tomato foam mixture into wet ingredients, and whisk together thoroughly.
Combine wet ingredients into dry ingredients, then fold in nuts.
Pour batter into prepared pan, and bake in oven for about 30 minutes, rotating after 15 minutes. When cake is done, it should be springy to the touch.
Allow to cool, and frost. Top with any extra nuts, or eat as is.