Which, unfortunately was not the right answer. The answer is in fact five. The flavour that you missed is umami, which comes from a Japanese word and refers to a savoury flavour often found in grilled meats or broths.
When they got back to the house, they found that the broth had boiled over, -that the dinner was spoiled; and that two shirts, which had been hanging before the fire, were scorched and utterly ruined.
This can be tested by transferring a pure sample of bacteria from the culture to a sterile tube containing a mixture of " urea agar" broth and phenol red.