Tammye Nash. |. Managing Editornash@dallasvoice.com “We knew this was going to be a challenge,” Andrew Pettke said of having to keep secret for months the fact that he and his husband Chef Navin Hariprasad and their business partner Sarah Hartshorne — aka Team Mystikka Masala — had won The Great Food Truck Race: Gold Coast last summer. “When we and [Team Lunch Ladies] found out we were the final two teams, we talked about it, and we made a pact that after it was over, we would tell everyone that