1. Combine cream cheese, salmon, lemon juice and heavy cream. Blend until smooth; refrigerate for 30 minutes.
2. Wash and dry tomatoes. Cut tops off tomatoes, remove seed and pulp. Keep in refrigerator until almost time to serve. Place tomatoes upside down on tray to drain.
3. To serve, soften salmon mousse with wooden spoon and fill tomatoes. To garnish, use fresh dill. Place tomatoes on bed of greens.