Salmon Patties With Lemon Cheese Sauce

• 1 egg (beaten)
• 1 lemon cheese sauce
• 1/4 beau monde seasoning
• 270 gr salmon
• 120 ml milk
• 110 gr seasoned bread crumbs divided
• 65 gr all purpose flour
• 30 gr onion (grated)
• 28 gr butter
• 5 ml dry mustard