Start by peeling and cutting the garlic, onions and shallots. Fry the garlic, shallots and onions together in a pan with a little olive oil, salt and pepper.
Add the spinach and grated nutmeg. Mix. Remove from heat.
Add the soy cream. Mix again.
Prepare your salmon: remove the skin and make thin slices.
All you have to do is assemble your lasagna and add some grated Gruyere cheese.
Bake on 180° for 40 mins then grill for 3 mins on 220°.