Prepare farro according to packaging. Once it’s done cooking, allow to cool to room temperature.
In a large bowl, combine next 6 ingredients (fennel through vinegar). Cover and place in refrigerator to marinate together while farro cooks and cools.
Once farro is done, remove fennel mixture from refrigerator, and toss farro in along with pecans, and season with salt and pepper to taste. Serve cold.