Take a small spoonful of gravy and let it cool for several seconds before tasting. You’re looking for deep savory flavor, balanced black and white pepper, subtle garlic, subtle onion, rich brown-gravy flavor, and enough seasoning to make those mashed potatoes start calling your name. You should not taste salt first. If the gravy tastes flavorful but slightly flat, don’t immediately add salt. The pork hasn’t gone in yet, and it will contribute additional flavor. If the gravy genuinely needs salt, add ¼ teaspoon kosher salt, stir thoroughly, and taste again. Continue only in ¼-teaspoon increments.