The best way to prepare the best food is to use the freshest ingredients which are often to be found at farmer's markets and public produce markets. You don't have to go to the countryside to find them. There's probably one in the middle of your own town. If you can find your way to the following markets, you won't be disappointed.  Here are examples of some popular markets.

Hollywood Farmers' Market 1623 N Vine Street Los Angeles, CA United States 90028-8802

Pike Place Market 86 Pike Pl Seattle, WA United States 98101-2025

Granville Island Public Market 1441 Cartwright Street Vancouver, BC Canada V6H 3R7