Spinach and Potato Roulade

My daughter brought this recipe back from France but, during the journey, managed to forget what little of the French language she had learned. We found it difficult to imagine the instructions given by her hostess that she had written down were the correct ones. For example, the roulade had to be boiled! We attempted this, but it resulted in disintegration. Baking yielded better results. This amount will serve six to eight people as an accompaniment to meat.