My mother-in-law cooks this kesme helva whenever I want. This is a great dessert that you can have by the 5 PM tea. It melts in your mouth and you feel it on every side of your tongue. It is really easy. You can decorate it with chocolate sauce if you wish.
Put flour in a wide saucepan. Cook and stir over medium heat until fragrant, about 15 minutes. Don't let it turn yellow. Add sugar slowly, mixing well, until combined.
Add melted butter and vanilla to the mixture. Mix all by a spoon or your hands, but be careful, as it can be very hot, until it has a sand-like consistency. Transfer to a 9x9-inch pan, pressing down as much as you can.