Chop the pickles and onions. Finely chop the pickles and onions by hand. Set aside.
3-4 medium pickles, 1 medium onion
Sauté onion. Melt the butter in a large saucepan over medium-high heat. Add the onion and sugar and sauté for about 3 minutes, stirring frequently, until softened.
4 tablespoons unsalted butter, 1 tablespoon sugar
Toast the curry and tomato paste. Add the curry powder and cook for another 2 minutes, stirring constantly, until fragrant. Add the tomato paste and stir for a few more seconds.
4 tablespoons curry powder, ¼ cup tomato paste
Add the remaining ingredients. Add the passata (or crushed tomatoes), ketchup, salt, bouillon, vinegar, and reserved minced pickles. Stir well to combine.
3 ½ cups passata, 2 cups tomato ketchup, 2 teaspoons salt, 2 teaspoons better-than-bouillon beef, 1½ tablespoons apple cider vinegar
Simmer. Bring the sauce to a boil over medium heat, stirring occasionally. Reduce heat, cover with a lid, and simmer for 15 minutes. Taste and adjust seasoning as needed.
Grill the sausages. While the sauce is cooking, grill the sausages on a BBQ or pan-fry them until nicely browned.
16 sausages
Serve it or jar it up. Serve over grilled, sliced sausages with a sprinkle of curry powder on top, or, while still hot, ladle the sauce into 4 clean mason jars (1 lb / 450 g each) and seal immediately.