Melt the butter in a saucepan. Take a larger pot, as the small will be uncomfortable to mix.
Add flour, half (200 g) of sugar and fry for 10-15 minutes, stirring constantly with a wooden spoon over low heat. The finished mass will be Golden and crumbly.
In parallel, you can cook the syrup from the water and the remaining 200 g of sugar. It just takes those 15 minutes that fried flour.
Remove the flour mixture from the heat and add the chopped nuts. Nuts need to be pre-fried in a pan or, like me - in the oven. With almonds still need to lift skins -. To do this, put it in boiling water for a couple of minutes, and then throw it on a sieve and pressing your fingers on the rounded end of the nut to release the nut from the skin.
Then, stirring constantly, pour the syrup until a thick homogeneous mass.
Return the mixture back to the stove and cook on low heat for another 5-7 minutes.
Cool slightly and put on a baking sheet and walk on the mass with a rolling pin or hands to form a smooth layer 4-5 cm thick.
Allow halva to cool completely and cut into portions. I've been cold all night. Enjoy your tea!