Dallas has great Korean, Ethiopian and Vietnamese food and decent Thai and Salvadorian. Houston has the best Vietnamese and Chinese food outside the west coast imo (though queens gives houston a run for its money with Chinese food.)

Edit: though I think DC has better French and Italian than major Texas metros, plus a greater variety of more obscure cuisines (by American diasporan standards) due to the breadth of diversity, ie Balkan, Uyghur, Bangladeshi, Peruvian, Georgian, Filipino, Portuguese, Russian etc etc.