Adapted from French Taste by Laura Calder
serves 4
bechamel: 1 1/2 cups milk 1/4 onion 1 bay leaf 1 garlic clove 2 tbsp butter 2 tbsp flour 1/4 cup sour cream | gratin: 1 bunch chard 1 tbsp olive oil 1 onion, sliced 1 ham steak, chopped (optional) 100 g Gruyere, grated Finely grated Parmesan to taste |