I live in Mount Dora and visit the Garden Gate Tea Room whenever we have "Girls Day Out". They have wonderful lunch dishes (Chicken Pot pie, Turkey with all the trimmings, sandwhiches, and salads) and the best deserts.
I've not experienced the "High Tea" as of yet because a 24 hour reservation is required but I plan to do so in the furture.
The Tea Room and gift shop are lovely and the staff is very friendly.
Highly recommend visiting if in the area.