There are two main types of Opeth dinner. I will list below.
Tapas: (ex. For Absent Friends, Patterns in the Ivy) Small, slight, and absolutely scrumptious. Leaves you both satiated and endlessly hungry for more.
The other Opeth songs for the most part have a few key ingredients, and then vary in presentation and order.
These are the ingredients:
Sushi (usually the acoustic parts): fresh and crisp. These parts can both be light and invigorating (fresh salmon, perhaps cucumber roll with a little wasabi) or more buttery and thought-provoking (freshwater eel nigiri with generous sauce)
Brazilian Churrascaria type meats (you know where the meats are varied but obviously of the same ilk), all roasted and delicately placed on your plate after they slide down a sword. Sharp but intricate spices, perfectly delicate and bold at the same time. The heavy parts of songs such as The Funeral Portrait are like this.
Roast Sweet Potatoes with brandy infusion and a splash of vinegar. These are those moments of pure electric bliss when it all culminates. It has the sweetness and invitational qualities of the comfort food, but the subtle hint of vinegar and the sweet yet biting brandy both allow the transition from and back into the Brazilian Meats. The hardened exterior of the sweet potato cracks and open, allowing the divine flesh inside its grand appearance, soft, silky, and rich. The huge melodic part in Bleak at 6:40 is this component. Just pure bliss.
Cheese/Wine: The final accompaniments many times served alongside other sections, this pair can take the shape of certan guitar solos, some of the e-bowed guitars of BWP, etc. Opeth cheeses range from bold to understated, but are always rich with flavor and depth and rarely if ever plebeian. The wine is sometimes strong, but many times more a dessert/fruit wine just to round out the palette and both take the edge off of the other items and bleed another thoughtful divergence of sophistication into the mix.
A typical opeth songs will henceforth look similar to this:
Brazil Meat-Brazil Meat-sushi-sushi-sushi-brazil meat-sweet potato-brazil meat-sushi-brazil meat. Wine is present during the sweet potato and the last sushi and the last brazil meat. Cheese available in second and fifth brazil meat, possibly in second and third sushi.
Sometimes songs are slightly different, such as Dirge for November which looks like this:
Tapas-BRAZIL MEAT (duration) - sushi/tapas
Just my two cents.