Gifted with a 5 lb. bag of precut salad and need ideas to use and freeze

Basically the title. This big bag of precut salad is mostly bite sized pieces of iceberg lettuce, with some small amounts of carrots and also small pieces of purple cabbage.

5 pounds is so much and I know it will go bad before I can manage it all. My neighbor had been to a local food pantry and picked up a couple of these bags as the pantry was encouraging people to take them as they had a surplus and wanted the neighborhood to benefit.

I know that I can boil some of this up and use some seasonings and then freeze that for soup stock. Any other ideas?