custom food order; special meal request
Refers to a specially arranged meal, often at a hotel or restaurant, that is not on the regular menu. The term 別注 (べっちゅう) means 'special order'.
See also: 別注
When I ordered a custom meal at the hotel, they served a very luxurious course.
別注 is the broader term for a special or custom order, while 別注料理 specifically refers to a custom food order.
Compound of 別注 (べっちゅう, 'special order') and 料理 (りょうり, 'cooking, cuisine').