Cook 250 grams of smoked bacon in a large skillet over medium-high heat, turning occasionally until evenly browned, about 10 minutes.
Drain the bacon slices on paper towels and crumble the bacon when cool.
In a saucepan, stir together 900 grams of ripe chopped tomatoes, 1 diced sweet yellow onion, 1 cup of white sugar, 2 1/2 tablespoons of apple cider vinegar, 1 1/2 teaspoons of salt, and 1/4 teaspoon of black pepper.
Bring the mixture to a boil, stirring constantly to dissolve the sugar.
Stir in the crumbled bacon and cook over medium heat, stirring often until the spread is very thick, about 1 hour.
Adjust salt and black pepper to taste.
Cool the mixture and spoon it into a 1-pint glass jar with a lid.
Store the jam in the refrigerator for up to 1 week or freeze it for up to 2 months. If freezing, use small jars and let them thaw in the refrigerator overnight before using.