Shin kimchi refers to freshly made kimchi that is still crisp and mildly tangy. As time passes after opening, the flavor becomes more sour, and this stronger tangy taste is often referred to as "Shin Kimchi" (aged kimchi). While fresh kimchi is great on its own, this more fermented version can be used to create delicious dishes like kimchi fried rice or stir-fried kimchi with sausages or tuna. The sourness of Shin Kimchi adds depth and complexity, making it a tastier and more flavorful option compared to fresh, less fermented kimchi.