This Tuna dip with broccoli, potatoes and eggs dish is excellent for entertaining as you can prepare it in advance and simply serve when your guests arrive.
To prepare the ‘dippers’, boil a big pot of water with one tablespoon of salt for each 1 litre / 1 3⁄4 pints / 4 1⁄3 cups of water. Add half the broccoli and blanch for 2 1⁄2 minutes then quickly remove with some tongs or a large slotted spoon to a large bowl filled with iced water, to chill it. This will help retain the colour and texture. Repeat with the rest of the broccoli.
Once that is done, use the same water to boil the potatoes until soft. It takes about 15–20 minutes depending on their size. The best way to check that they are cooked is to insert the tip of a knife into one: it should go in easily. Drain and set aside.
In the meantime, boil your eggs by plunging them into boiling salted water for 7 minutes, then immediately drain and pop them into a bowl of ice cold water too, to halt the cooking.
Put all the ingredients for the sauce in a small food processor and whizz until smooth. Transfer to a bowl.
Peel and halve the eggs. Quarter the endive, arrange it with the broccoli and potatoes on a lovely plate, and sprinkle with salt and pepper. Serve with a generous bowl of the dipping sauce, sprinkled with the cayenne pepper, if using.