Let there be a timed (5 minutes) salad competition with two or three people in a team. Have them come up with the ingredients and condiments and when everything is set up on a table, that is when the time starts to run. Let them cut the vegetables, add flavors, spices and condiments, plate it and be ready for presentation in front of judges and audience. Make the audience taste the preparations and vote for the best one. Let the audience palette decide which is the award winning salad. You could also have chilly cook-offs (either prepared in home and brought to office or maybe cooked in the office itself).