Hello Victor. Yes, the cooking time does vary significantly depending on the variety of lentils you are preparing, as well as whether they are whole or split.
Here is a general breakdown of boiling and simmering times by variety:
1. Brown and standard Green lentils: These take about 20 to 30 minutes. They soften nicely while still holding a bit of their shape, making them a versatile choice for side dishes.
2. French Green (Puy) and Black (Beluga) lentils: These take about 25 to 35 minutes. They are firmer and hold their shape exceptionally well, which makes them ideal if you want a distinct, slightly toothsome texture for a dinner side.
3. Red and Yellow lentils: These are usually split and cook very quickly, usually in about 15 to 20 minutes. Keep in mind that they break down into a soft puree or porridge consistency, so they are generally better suited for soups or dals rather than a standalone whole-grain side.
For best results across all varieties, thoroughly rinse the lentils first in a fine-mesh strainer to remove any dust or debris. Combine them in a pot with roughly three cups of water or broth for every one cup of lentils. Bring the pot to a gentle boil, then immediately reduce the heat to low, cover partially with a lid, and let them simmer rather than vigorously boil, which can burst the skins. Start tasting for your desired tenderness a few minutes before the minimum suggested time, and season with salt toward the end of cooking. I hope this helps you prepare a wonderful dinner.