1. Preheat the oven to 200 ° C (Th 6-7). Defrost the spinach, over low heat, in a saucepan, then remove the residual water (do not hesitate to press to release it!). Chop them roughly (I do it with a chisel).
2. Crumble the goat cheese log.
3. In a large buttered oven dish, place a layer of lasagna, then a layer of spinach, then a layer of goat cheese crumbs, then a little béchamel, then a little salt and pepper, then again a layer of pasta...
4. Make 2 or 3 layers, ending with the béchamel and covering with grated Gruyere.
5. Cook for about 30 minutes and serve hot, with a walnut salad for example.