Cover bottom of cooking pan lightly with olive oil.
Rinse tomatoes and remove tops as needed.
Heat pan to medium, and add leek and spinach mix and seasoning mix to pan.
Add tomato and sauté until tomatoes begin to burst. Stir frequently to ensure even cooking.
Add brown sugar and stir in completely.
Reduce heat to low and cover, for about 10 minutes, stirring occasionally.
Remove lid and mash tomatoes with a ricer. Stir and simmer for another 10 minutes.
If desired, blend about 50% smooth using an immersion blender.
Remove from heat and serve.