Your Japanese curry might lack thickness and gloss due to insufficient starch, fat, or cooking time. Adding a slurry, browning the ingredients properly, and simmering for longer can help achieve the desired consistency.
Achieving the perfect thick and glossy Japanese curry requires a combination of techniques and ingredients. Here's a breakdown of the key factors:
Starch Content: Japanese curry roux contains starch, which thickens the sauce as it cooks. If your curry isn't thick enough, it might be due to using too much liquid relative to the roux, or the roux itself might be old and have lost some of its thickening power. You can add a slurry of cornstarch or potato starch (1-2 tablespoons mixed with cold water) towards the end of cooking to boost the thickness. Alternatively, grating a small amount of apple or adding a tablespoon of honey can also contribute to thickening and gloss.
Fat Content: Fat contributes to the glossy sheen of the curry. Using fattier cuts of meat, like pork belly or chicken thighs with skin, can help. Also, ensure you're using enough oil or butter when sautéing the vegetables and meat at the beginning. The fat renders out and emulsifies into the sauce, creating a richer texture and appearance.
Cooking Time: Simmering the curry for a sufficient amount of time is crucial. This allows the starch to fully gelatinize and thicken the sauce, and it also helps the flavors meld together. A longer simmering time also allows the collagen in the meat to break down, further contributing to the richness and texture. Aim for at least 30-45 minutes of simmering, or even longer for a deeper flavor.
Browning the Ingredients: Properly browning the meat and vegetables before adding the liquid is essential for developing a deep, rich flavor and color. The Maillard reaction, which occurs during browning, creates complex flavor compounds that contribute to the overall taste and appearance of the curry. Don't overcrowd the pan when browning, as this will steam the ingredients instead of browning them.
Roux Quality: If you're making your own roux, ensure you cook it long enough to develop a nutty aroma and a light brown color. Undercooked roux will have a floury taste and won't thicken the sauce properly. If using store-bought roux, consider trying a different brand, as the starch content and quality can vary.
Don't add the curry roux directly to boiling liquid. Instead, turn off the heat, let the liquid cool slightly for a minute or two, then gradually whisk in the roux to prevent clumping.