Thoroughly drain the tuna and place it in a large bowl. Add cranberries, celery, parsley, red onion (if using), mayo, mustard, lemon juice, olive oil, plus salt and pepper to taste. (I start with ¼ teaspoon salt and ⅛ teaspoon pepper.)
Stir well, then taste and adjust as needed. Add more mayo for extra creaminess. Enjoy as is or serve on apple slices, bread, or crackers.
Video
Notes
Note 1: Serving Suggestions: Spread it on toasted bread with mayo and lettuce, spoon it into crisp lettuce leaves for a light wrap, top apple slices with white cheddar, microgreens, and tuna salad, fill a halved avocado, or make a tuna melt by adding cheese and broiling until melted.Storage: Store in an airtight container in the fridge for up to 3 days. Give it a quick stir and add more mayo if needed before serving.