"To add some tang" means to include or enhance a flavor, ingredient, or element that is sharp, strong, or contrasting, which can make something more interesting or lively. Full definition
I make a hash of my first attempt, releasing the brake too slowly without full throttle, which adds a tang of clutch lining to the cockpit ambience, but a few attempts later I make what feels satisfyingly like an optimum start. (evo.co.uk)
Greek yogurt adds a tang and creaminess to the fluffy egg center baked with spinach, sautéed leeks, and crunchy bacon bits. (foodiecrush.com)
The grapefruit dressing adds tang and sweetness and roasted almonds add healthy crunch. (foodandwine.com)