Menu rendered as unordered list: how can I assign an ID to the UL tag?

I have a databound asp:menu control that is set to render as an unordered list. It works great, except that it wraps the UL with a DIV and assigns the menu ID to the DIV instead of the UL.
In order for a responsive menu add on to work with the list on the client side, it only works if the UL has a name.
My question is very simple: using Visual Studio, how can I assign the outermost UL an ID that I assign?

Thank you