Omitting Ingredients

This is a two part question:

  1. my mom has a recipe for gumbo which requires tomato paste. I can no longer eat tomato products. Can I just omit the tomato paste?

  2. In other recipes that call for tomatoes, tomatoe pieces, etc., not the juice just the tomatoe… Can I just omit if it is not a tomato based recipe, but the tomato is just one ingredient.

I would try using red bell pepper paste in place of the tomato paste.