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Heat a frying pan and toast the walnuts, tossing until they are slightly browned and smell nutty, then leave to cool.
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Stir the sugar and vinegar in a bowl, and leave for 5 minutes until the sugar starts to dissolve, then add the grapes and toss.
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Leave for 10 minutes while you prep the rest of the ingredients.
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Put the watercress onto plates or a sharing platter, then top with the pear and taleggio.
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Drain the grapes but reserve the liquid.
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Whisk 2 tbsp of olive oil into the pickling liquid.
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Scatter the grapes over the salad then drizzle over 3-4 tbsp of the dressing and finish with the walnuts.