In a blender jar add almonds and grind them. In initially it will be like almond meal (flour). Then grind again. Slowly the ground almond will start sticking to the sides of the jar. Scrap the sides of the jar and bring to the middle and grind again. Now add salt to it and grind again. Slowly it will get that buttery texture. The whole process will take 15mins. While grinding scrap the side frequently. It will help in grinding and also give some rest to the grinder.