Pure taste is phenomen increasingly associated with the food without starches and industrial additives. "Pure taste" restaurants offer paleo diet, gluten free and dairy free, SCD (specific carbohydrate diet) and other low-carb diets.
First step for low carb diet is leave out annex to eat and replace it of vegetable. Second step is do not use industrially processed additives and thickeners. That means prepare food from the fresh ingredients both at home and in better restaurants or cafeterias.
I would like to emphasize zhat is notin new. For example high gastronomy rarely using flour for thicken and certainly not used glutamates, blanks and similar "achievements" of today's food industry.