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Finely grate 2cm ginger into a cocktail shaker, add 7-8 ripe cherry tomatoes and crush well with a muddler. Fill up with ice and 100ml Mediterranean gin. Shake well, then double strain into two glasses. Top with more ice and 200ml Mediterranean tonic. Garnish each glass with a halved cherry tomato on a cocktail stick. Add a few drops of arbequina or another good quality extra virgin olive oil just before serving.