Rooms of Hogwarts

Kitchen

Answer: SEA SALT

Each of these “recipes” is actually two recipes blended together. The strings of letters at the end are the names of the two dishes blended together, plus one extra letter. The extra letters spell out the answer.

BORSCHT + PAD THAI + S
FALAFEL + PEKING DUCK + E
TIRAMISU + HAGGIS + A
YAKITORI + FONDUE + S
PAELLA + GULAB JAMUN + A
GUACAMOLE + KIMCHI + L
POUTINE + BAKLAVA + T