Chess pie is a solid part of Southern baking. The foundation is based on sugar, eggs and butter forming a custardy-like filling. There are several bakers that seek to find a solution to reduce the sweetness without modifying the nature of the pie. Buttermilk will do this job exactly. Its acidity modifies the taste, feel, and framework in quantifiable manners. Any slight alteration in the composition of liquids causes a significant change in the taste and mouthfeel.
The background of Traditional Chess Pie

In a traditional chess pie, granulated sugar, whole eggs, butter and a bit of cornmeal or flour are all that is needed. The sugar proportion is high which creates a crust on the top, and a thick center. In the absence of an acidic element the sweetness prevails. The flavor profile is straightforward and simple.
Why Sweetness Needs Balance

Traditional recipes have a tendency of containing more than one and half cups of sugar per pie. The effect of such concentration is a sweet finish. This effect is neutralized by acidic components that activate other receptors of taste. A pie of balanced taste is less heavy.
The contribution of Buttermilk in Baking

Butter milk has lactic acid that reacts with baking ingredients thus altering texture. The sweetness is soothed in custard-based pies and gives it a slight tanginess. The implication is the multi-faceted flavor as opposed to one-dimensional sugar tone.
Change of texture on buttermilk

The filling is smoother when some of the conventional liquid is substituted with buttermilk. Baking involves the interaction of the acid with eggs and sugar. Even coagulation is facilitated by this process. The pie is creamy on the inside and contains less cracks on the surface.
How Much Buttermilk to Use

One of the practical solutions includes the replacement of a quarter- to a third cup of milk or cream by buttermilk. This ratio has structure and brings tang. The pie range beyond this takes the pie towards a buttermilk pie profile.
Considerations of Flavor Pairing

Butter milk is also compatible with Vanilla extract, lemon zest and a little bit of nutmeg. These flavors do not overwhelm the bottom flavor. Butter milk is commonly added to baked goods to provide balance by cutting sugar by two tablespoons.
Tempering and Timing Baking

The Chess pie normally takes between 45-55 minutes to bake at 350 degrees Fahrenheit. Having buttermilk in the mixture, it is necessary to control the center. When taken out of the oven, the filling must have a small jiggling middle. Overbaking leads to dryness.
Comparison of Butter milk and Lemon juice

Acidity is further brought by lemon juice, but a sharper note is the result. Buttermilk provides softer flavored tang and provides fat and protein. These have an influence on texture that lemon juice does not have. The distinction is evident in one on one tasting.
Storage and Shelf Stability

Buttermilk does not reduce refrigeration storage. At temperatures up to or less than 40 degrees Fahrenheit, the pie lasts 3-4 days. Surface covering eliminates loss of moisture and hardening of surfaces.
Serving Suggestions

The pie is served a little chilled which adds to the tangy contrast. The custard is enriched by a little whipped cream, which is unsweetened and does not add sweetness to the custard. When the material has cooled in two hours, clean slices are easily made.