Spanish tomato salad

Name: Spanish tomato salad
Ingredients: 1 ¼kg mix of tomato, use different varieties and colours, at room temperature; ½ red onion, very thinly sliced; 1 ½ tsp caster sugar; small bunch parsley, roughly chopped; 2 tbsp sherry vinegar; 4 tbsp extra virgin olive oil, plus a little extra for drizzling; 1 small garlic clove; 50g toasted flaked almond; 6 slices Iberico or Serrano ham; 75g manchego cheese, shaved