Crockpot Chicken & Artichoke Casserole

• 2 artichoke hearts (marinated)
• 1,400 ml boiler-fryer chicken
• 120 ml rich chicken broth
• 45 ml sherry
• 20 gr quick cooking tapioca
• 14 gr butter
• 1 gr pepper (white)
• 1 gr paprika
• 1 gr tarragon (dried)
• 1 package mushrooms