A Tempting Salad Luncheon, you say. Well, those are words for the customers. The text has other phrases for insiders, for managers:

"Make sure you use genuine Jell-O brand gelatin, though. It's high 'bloom strength' means it stays firm longer."

You've no idea what that means, do you? Well:

"Bloom is a test to measure the strength of a gel or gelatin. The test was originally developed and patented in 1925 by Oscar T. Bloom.  The test determines the weight in grams needed by a specified plunger (normally with a diameter of 0.5 inch) to depress the surface of the gel by 4 mm without breaking it at a specified temperature."