Wash and soak the lentils for 1-2 hours. Once soaked, rinse them thoroughly in running water.
Bring 2 cups of water to a rolling boil. Add it to the soaked lentils and let it cool down for 15-20 minutes.
Transfer the lentils and water to the blender and grind into a fine paste. Transfer the ground mixture to a large saucepan. Add the remaining two cups of room-temperature water and salt. Whisk it well.
Place the saucepan on medium heat and bring it to a boil. Reduce the heat to low and cook the lentils, stirring continuously to prevent lumps from forming. Cook for about 10-12 minutes or until the mixture thickens and comes together.
Grease and line a square tin, then transfer the mixture to it. Level the mixture using a spatula. Cool the pan and then place it in the refrigerator for the tofu to set. Let it set in the fridge for at least 4 hours, preferably overnight. The longer it sets, the firmer it will be.
Once set, you can slice and cook the red lentil tofu like regular tofu.
Notes
Soak the split red lentils for at least an hour. This helps soften them and makes blending easier, resulting in a smoother tofu texture.
Strain the blended lentil mixture through a fine-mesh sieve or cheesecloth for an even smoother tofu. This removes any remaining coarse particles and ensures a silky tofu.
A non-stick pan can make the cooking process smoother, reducing the chances of the mixture sticking.
Allow the tofu to chill in the refrigerator for at least a few hours or overnight. This helps it set properly and makes it easier to cut into desired shapes.