Mix together the flour, yeast, salt and bread improver in a food processor, add the melted butter and enough warm water to mix into smooth dough. Put the dough onto a lightly floured surface and continue kneading for a couple of minute until dough is elastic. Put the dough in a covered container in a warm area so that it rises and doubles in bulk. Knock down and allow to rise till double in size again. Next, transfer the proved dough onto a clean surface and roll into the shape of a long bread stick. Join the two ends together to form a ring and place on a baking tray. Brush with water, sprinkle liberally with sesame seeds, press in the almonds and slit with a sharp knife. Allow to rest again until the ring is double in bulk. Bake in a moderate oven until golden. Brush with water once again when you take the bread ring out of the oven.