Ingredients
Method
- Preheat oven to 350 degrees F. Remove seeds and pulp from tomato halves with a spoon, then cut halves vertically. Place tomato quarters on three rimmed baking sheets lined with foil. Sprinkle with salt.
- Bake tomato quarters for 1.5 hours, checking every 20 minutes after the 40-minute mark to prevent burning. Remove from oven and cool slightly.
- Process tomatoes in a food processor in batches until smooth. Transfer to a bowl and stir in citric acid. Add more salt if needed for taste.
- Return the puree to one sheet pan and spread out evenly. Bake at 350 F until tomato mixture is deep red and very thick, stirring every 20 minutes (could be anywhere from 2-3 hours based on your oven and water content of your tomatoes).
- Spoon mixture into hot sterilized jars, leaving 1/4-inch head space, remove air bubbles as best you can, wipe rims, and apply lids and bands. Process for 40 minutes in boiling water, adjusting recipe for altitude. Remove jars from heat to cooling rack and let sit undisturbed for 24 hours. Inspect seals and refrigerate any jars that failed to seal for short-term use.
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