The Quay's Grouper Florentine

• 2 grouper filet (fresh)
• 1 flour
• 475 ml milk (hot)
• 120 gr swiss cheese (grated)
• 32 gr flour
• 28 gr clarified butter
• 20 gr parmesan cheese (grated)
• 18 gr butter (unsalted)
• 16 gr spinach (cleaned)
• 6 gr shallots (chopped)