I was making tomato sauce last night when I discovered I had no tomato paste. Aside from being tired and unwilling to run out to the store, I had no desire to spend money on tomato paste. It didn't fit in with my living mainly out of the cupboard plan. At the same time, my family gets grumbly with watery tomato sauce.
Here's my simple solution. I took a can of diced tomatoes and gave them a whirl in my Vita-Mix. Then I poured them through a fine mesh strainer. The end result was tomato paste and tomato juice. I used the tomato paste in the sauce and the tomato juice is in the fridge waiting to be used in another recipe.