Yes, you can make tomato soup from tomato paste and here's why:   Taste: Tomato paste is more uniform in flavor and will yield more consistent results. Texture: While fresh tomatoes can result in a watery consistency, tomato paste will always give you a thick, creamy soup. Availability: Tomato paste is an easy-to-find pantry staple that's available year-round. Truly excellent tomatoes are only available during the summer months.   To put it simply: For flavor, texture, and ease, I believe tomato paste is an excellent option for soup.