The Slow Food Movement simply emphasizes taking time to find good quality ingredients and learning to prepare them well. This goes from fresh and interesting produce such as a range of greens to
artisinal cheeses and breads. I don't know how
left wing it is since it mainly protests against the bland sameness of how many people approach food. It proposes grocery shopping as a kind of daily
foraging in the markets in the sense of
Alice Waters's
Chez Parnisse rather than running into the super-mega-grocerystore once a week and filling up the grocery cart.
Naturally, the question of genetic-modification is a concern but then so is the narrowing bandwidth of strains of lettuce.