Why Add Lemon Juice to Tomatoes and Salsa Before Canning?
FN-1396, January 2009 ______________________________________________________________________________________________________________ Julie Garden-Robinson, Ph.D., L.R.D., Food and Nutrition Specialist Kari Houge, R.D., Program Assistant (former) Ronald Smith, Ph.D., Horticulture Specialist ______________________________________________________________________________________________________________ You may have heard that adding lemon juice, citric acid or another acid to tomatoes before canning is important, but maybe you are not sure why. It’s all about pH.