Add tomatoes, cayenne & stevia to a small saucepan and bring to boil, reduce heat to a simmer until it reduces by half - about half an hour--stir occasionally.
In another small saucepan, combine onion, vinegar, cinnamon, cloves and celery salt. Bring to boil, remove from heat, and strain out solids.
Add strained vinegar and salt to tomato mixture. Simmer for 20 - 30 minutes or until ketchup is desired consistency. I ran mine through a magic bullet to get it nice and smooth after it cooled which you can do if you like a really smooth ketchup.
Store in a clean glass jar for up to a month in the fridge.
Add horseradish for cocktail sauce or chopped pickles and mayo for thousand island dressing. So good you'll be tempted to eat it straight out of the jar with a spoon! The perfect topping for this burger!
Why is this mixture separating into a watery sludge halfway through the simmer? Commercial tomato purée contains varying water content, which dictates whether your reduction hits the target consistency in twenty minutes or requires a full forty. Whole spices must be strained properly, and the tomato base needs precise heat control to avoid scorching the natural sugars.
Simmer the initial tomato purée, cayenne, and stevia blend until volume decreases by exactly fifty percent.
Boil the vinegar, dehydrated onions, cinnamon stick, cloves, and celery salt separately before straining out the solids.
Process the cooled mixture in a high-speed blade appliance for thirty seconds if a ultra-smooth texture is required.
Store the finished condiment in a sanitized glass jar at refrigeration temperatures for up to thirty days.
Utilize powdered stevia extracts with caution, as conversion ratios vary compared to liquid drops.
Fresh tomatoes introduce excess moisture that completely alters the density compared to canned purée, requiring extended evaporation time. Proper sealing extends refrigerator storage significantly.