A delightful spread combining the sweetness of caramelized onions with the tang of tomatoes, perfect for enhancing your dishes.
Heat the olive oil in a heavy frying pan over medium heat.
Ensure the pan is evenly heated before adding the oil to prevent sticking.
Add the sliced onions to the pan and sauté until they begin to soften and turn golden.
Stir occasionally to ensure even cooking and prevent burning.
Sprinkle the onions with sea salt, reduce the heat to low, and continue cooking until the onions are caramelized and tender.
Low heat is key to achieving a deep caramelization without burning.
Add the red wine, thyme, mustard seeds, and red pepper flakes to the pan, stirring to combine.
Let the wine reduce slightly to concentrate its flavor.
Continue cooking on low heat for 30 minutes, stirring occasionally.
Stirring occasionally prevents sticking and ensures even cooking.
Add the chopped tomatoes to the pan and cook for an additional 15 minutes.
Chop the tomatoes finely for a smoother texture.
Remove the pan from heat and let the relish cool.
Cooling allows the flavors to meld together.
Transfer the relish to a jar and store in the refrigerator.
Use a clean, airtight jar to maintain freshness.
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