I can suggest some common ingredients that many people use to enhance the flavor of their stews and make them delicious:
Herbs and spices: Adding a combination of herbs and spices like thyme, rosemary, bay leaves, paprika, cumin, or even a pinch of cinnamon can elevate the taste of your stew.
Aromatics: Onions, garlic, and ginger are often used as a base for stews to build flavor.
Tomato paste or sauce: This can add depth and richness to the stew.
Wine or broth: Using a good quality wine or broth as the liquid base can add complexity to the flavors.
Umami boosters: Ingredients like soy sauce, Worcestershire sauce, or miso paste can enhance the umami taste and make the stew more satisfying.
Acid: A splash of vinegar or citrus juice can brighten the flavors and balance the richness.
Meat or vegetable stock: A well-made stock can provide a depth of flavor that water alone cannot achieve.
Browning the meat: Searing the meat before adding it to the stew can enhance the overall taste.
Root vegetables: Carrots, parsnips, and celery root are great additions that add sweetness and depth.
Finish with fresh herbs: Adding fresh herbs like parsley, cilantro, or basil at the end of cooking can add a burst of freshness and fragrance.
Remember, the secret ingredient to a delicious stew is often the combination of multiple flavors that work harmoniously together. Experimenting with different ingredients and finding the perfect balance for your palate is the key to creating an unbelievably delicious stew!