You can try calling. From the Disney website:
https://disneyworld.disney.go.com/faq/restaurants/kosher-products/
"Kosher meals can be accommodated at all table-service and select quick-service restaurants. Kosher meals should be requested 24 hours in advance by calling (407) WDW-DINE or (407) 939-3463. Guests under 18 years of age must have parent or guardian permission to call. Also be sure to indicate any dietary requirements upon arrival at your dining location. Please know there may be a higher wait time due to the special care we take to provide a kosher meal."
I haven't been following this but I vaguely recall that all Kosher meals are prepackaged and heated up for you in a microwave or under a heat lamp.