Whisk the dressing ingredients together, season to taste then set to one side.
Bring a pan of salted water to the boil and cook the salad potatoes for 15 minutes or until tender, adding the green beans in for the last 4 minutes of cooking. Drain and leave to one side to cool.
Boil the eggs for 6 minutes then run under a cold tap to stop the cooking.
Arrange the ingredients onto a serving platter finishing with the peeled and halved eggs and tuna chunks, then spoon over the dressing and serve.
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Type of tuna: There are lots of different kinds of tinned and jarred tuna on the market. Normal tinned tuna works perfectly but swap to a slightly fancier jarred tuna if you want to serve it for a special lunch.
Calories: 445kcal | Carbohydrates: 22g | Protein: 23g | Fat: 30g | Saturated Fat: 5g | Polyunsaturated Fat: 4g | Monounsaturated Fat: 20g | Trans Fat: 0.02g | Cholesterol: 191mg | Sodium: 668mg | Potassium: 730mg | Fiber: 4g | Sugar: 2g | Vitamin A: 1777IU | Vitamin C: 27mg | Calcium: 82mg | Iron: 4mg