The key to a fragrant, clear Yakhni that doesn't curdle lies in maintaining a low and slow simmer, and tempering the yogurt mixture before adding it to the broth.
Creating a perfect Yakhni requires careful attention to temperature and technique. Here's a breakdown:
Start with a good stock: Use high-quality meat (usually lamb or chicken) and aromatics like ginger, garlic, onions, and whole spices (cardamom, cloves, cinnamon) to create a flavorful broth. Simmer gently for a long time to extract maximum flavor.
Prepare the yogurt mixture: Whisk yogurt (full-fat is best) thoroughly until smooth. Add a thickening agent like gram flour (besan) or cornstarch to help prevent curdling. Mix well to avoid lumps.
Tempering is crucial: This is the most important step. Gradually add ladles of the hot broth to the yogurt mixture, whisking constantly. This slowly raises the temperature of the yogurt, preventing it from shocking and curdling when added to the main pot.
Combine and simmer gently: Once the yogurt mixture is tempered, slowly pour it into the main pot of broth. Stir continuously to ensure it's well incorporated. Reduce the heat to the lowest possible setting and simmer very gently. Do not boil!
Patience is key: Allow the Yakhni to simmer for at least 30-45 minutes, or even longer. This allows the flavors to meld and the broth to thicken slightly. Skim off any impurities that rise to the surface.
Final touches: Adjust seasoning with salt and pepper. You can also add a touch of dried mint or saffron for extra flavor and aroma.
Never leave the Yakhni unattended while it's simmering. Occasional stirring is essential to prevent the yogurt from settling and potentially curdling at the bottom of the pot.