You could say the side effects for this game are technically intended since the goal is to try and cause as many side effects as possible, though I guess the unintended side effects are the courses that DON'T kill any guests. Also gotta wonder why anyone stuck around after the first course or two XD
I think the game would be more engaging if instead of random poisons, the components you add are various toppings and mixing a weird topping with a food dish it would go terrible with is how the guests meet their demise. For example, extra spice to an already spicy butter chicken dish, sardines with ice-cream, peanut butter to clam chowder etc..