Prepare rice to package directions.
In a large pan, heat a few tablespoons of EVOO over medium-high heat. Add in beef, season with salt and pepper, and brown, breaking it up into smaller pieces as it cooks. Once browned, add in onion and cook a few minutes.
Fold in cooked rice and add Worcestershire sauce, ketchup, mustard and cheese. Stir until cheese begins to melt.
Garnish with pickles and serve.