If using canned whole cranberry sauce: pour it into a small pot and bring it to a low boil. Once it starts to boil, lower heat and let it simmer. If using jelled sauce: Cut it up into large cubes or chunks and stir them with a wooden spoon to break down chunks. Then, add to a small pot and bring it to a low boil, and then lower heat and let it simmer.
Add ¾ cup of orange juice and 2 teaspoons of orange zest, and 1 cup of sugar to the sauce pan.
Simmer for 4-5 more minutes until it reaches the desired consistency.
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Notes
Look for brands that use real sugar. Many commercial cranberry sauces are loaded with high fructose corn syrup or artificial sweeteners, which affect texture.
Avoid brands that add citrus fruits. Since you're adding orange juice, you don't want to overwhelm the taste of the cranberries.
Make sure there aren't any chunks floating around in the can. A quick shake should take care of rogue chunks!
Don't be afraid to mix it up. Canned cranberry sauce is extremely versatile so don't be afraid to experiment with different flavors. Try adding a little orange zest, fresh ginger, or a splash of bourbon. The possibilities are endless