While preparing chocolate based sweets, it is very important to melt the cooking chocolate before you start preparing the sweet. Cooking chocolate is available in thew form of bars. So first chop[ it up with a sharp knife on a chopping board. Chocolate should not be kept directly on flame because it is very delicate. The flame will spoil the chocolate. So always use a double boiler.
Keep a vessel filled to 1/2 with water. Bring it to boil. Switch flame to low. Transfer the chopped chocolate to another bowl which fits tightly into the vessel with water. The chocolate should never come in contact with the steam other wise it will seize. Then it will become completely useless. The bowl should not touch the water. It should be above the water level.
After some time the chocolate will start melting. Stir it with a spoon. When 75% done, remove the chocolate bowl from the vessel and place on a dry towel to get rid of water. Continue stirring until it becomes smooth and is of pouring consistency. Use as per the recipe. The chocolate will start hardening when the temperature drops. If it starts hardening in the middle of work, place it again on the boiler and melt it.