Baked Salmon Croquettes

• 1 scallion
• 1 egg
• 1/2 lemon
• 425 gr salmon (fresh)
• 240 ml cream (heavy)
• 220 gr bread crumbs (fresh)
• 120 ml sour cream
• 28 gr butter
• 5 gr dill (fresh)
• 1 gr salt