Cauliflower and broccoli gratin

Name: Cauliflower and broccoli gratin
Prep time: 15 min
Cook time: 50 min
Total time: 1 h 5 min
Cuisine: European
Ingredients: 1 garlic clove; 2 slices bread, torn in pieces (approx. 100 g) or 100 g gluten-free bread, torn in pieces; 10 g fresh parsley, (approx. 1 small handful); 50 g Parmesan cheese, cut in pieces (3 cm); 40 g butter, cut in pieces or 40 g olive oil; 40 g plain flour; ¼ - ½ tsp salt; ½ tsp ground nutmeg; 500 g milk; 500 g water, for steaming; 150 - 300 g cauliflower florets, cut in pieces (2-3 cm); 150 - 300 g broccoli florets, cut in pieces (2-3 cm)