Put the vinegar and sugar in a mixing bowl. Season with sea salt and freshly ground black pepper; stir together to dissolve the sugar. Add the cucumber strips, strawberries, watercress and mint; toss everything together well.
Divide the salad between 4 plates and add a few blobs of goats’ (or cream) cheese to the top of each. Splash over some olive oil and sprinkle with a little more salt and pepper before serving