Funny, I've been looking at this sort of thing myself.
I've found there are different versions of insurance for different types of liability - and they are really confusing. For example, General Farm Liability insurance, versus Product Liability insurance. Here's a paper and couple quotes from it:
General farm liability insurance typically protects against claims for bodily injury and property damage that occur on the farm premises or as a result of farm operations (IRMI, 2008). These policies cover accidents that affect farmers, employees, guests, and customers.1 Outlaw (2007) and the New England Small Farm Institute (2008) suggest that these general commercial or farm liability policies are appropriate for growers with pick-your-own operations and on-farm
stands. The New England Small Farm Institute (2008) further explains that farm liability insurance covers lawsuits only from activities considered “farming,” which is usually defined to include only agricultural production activities
and on-farm roadside stands. These policies also typically cover the sale of produce in its raw, unprocessed state, whether sold on-farm or at a farmers’ market.
But then it says:
Many fresh produce growers mistakenly believe that their general farm liability policy protects against claims of injury from contaminated fresh produce that causes foodborne illness. But as Hamilton (1999) explains, this is not generally
the case, because the injury usually happens off the farm premises. In this case, a product liability insurance policy is appropriate, as it protects against consumer claims of injury caused by a defective or hazardous product such as contaminated fresh produce. (Holland, 2007).
Insurance Coverage Options for Fresh Produce Growers from NCSU
It sounds like reading the fine print is really important in choosing a policy.
There are also things to look into having to do with processing food. For example, in some states, if you just wash off lettuce that's a processed food. And then that "product" can fall under different liability and potentially licensing.
Here is a list of different home business insurers from a soapmaker's website. Not sure if they do produce, but might be worth a try.
Business Insurance for the Handcrafted Industry
And I read online that one's local Farm Bureau usually has recommendations for local insurers of farm products.
Good luck! And please update this post with what you find when you have time. I'm sure it will be useful for many people.