Toast the sesame seeds in a coated pan over medium heat for approx. 10 minutes, stirring constantly.
Add the roasted sesame seeds to the blender and blend for about 20 minutes. To avoid overloading the blender, take frequent breaks and use the time to push the sesame seeds off the walls of the blender with a spatula. Continue blending the sesame seeds until you get a liquid paste.
Put the finished tahini into a sterilised preserving jar.