Baking Soda and Cream of Tartar (Best Option)
1/4 teaspoon baking soda + 1/2 teaspoon cream of tartar per 1 teaspoon baking powderBaking powder is essentially a combination of baking soda and an acid, often cream of tartar. Using these two separately allows precise control over acidity and leavening, which is crucial in tomato sauce to avoid altering its natural tanginess.
Ensure thorough mixing to prevent clumping and uneven reaction. Add the mixture early in the cooking process to allow full reaction and avoid residual alkaline taste.
Compared to commercial baking powder, this substitute provides a cleaner flavor profile and maintains the sauce's intended acidity without bitterness or off-flavors.