Pistachios are clean, pour boiling water for 30 minutes.
Drain the water. Set aside a little nuts, and the rest put into a blender. Add milk and sugar and vanilla. All good to grind into a paste. Heat 2 tablespoons of oil in a frying pan. Put the paste and whole nuts, fry, stirring constantly, 12-15 min.
The mixture should thicken. She's going to be in a ball.
Next, you need to take a flat shape, lubricate the remaining butter and put an even layer of paste. Smooth and cool. Frozen halva cut into small squares and serve. But I wanted to put it in silicone molds.
After hardening, remove, decorate as desired and serve.