Oysters And Artichoke Casserole

• 1 1/2 seasonings
• 1 oysters
• 1 bunch green onions
• 220 gr mushrooms
• 110 gr butter
• 65 gr browned flour
• 14 gr parsley (fresh)
• 10 ml lemon juice
• 1 gr thyme
• 2 packages artichoke hearts (frozen)