Unique Sandwich Spread

Wash and core the green sweet peppers, red bell peppers, and green tomatoes, then finely chop or grind all three vegetables along with the white onions until evenly minced.

Place the chopped vegetable mixture in a large colander and sprinkle with salt, allowing it to drain for 15-20 minutes to remove excess moisture.

Transfer the drained vegetables to a large heavy-bottomed pot and add the white vinegar, sugar, and celery seed, stirring to combine thoroughly.

Bring the mixture to a boil over medium-high heat, then reduce heat to medium and simmer for 20-25 minutes, stirring occasionally, until the vegetables are softened and the mixture has reduced slightly.

In a small bowl, whisk together the flour and prepared mustard until smooth, then slowly stir this paste into the simmering vegetable mixture to thicken it evenly.

Continue cooking for 5 minutes while stirring constantly to ensure the flour is fully incorporated and the mixture has thickened to a spreadable consistency.

Remove the pot from heat and allow the mixture to cool to room temperature, approximately 10-15 minutes.

Once cooled, gently fold in the salad dressing until fully combined and the spread reaches a smooth, consistent texture suitable for sandwiches.

Transfer the sandwich spread to clean jars, pressing gently to remove air pockets, and refrigerate until ready to use.