Goat's Cheese Salad With Sweet And Sour Onions

• 4 sun tomatoes (dried)
• 2 spanish onions
• 150 ml olive oil
• 120 ml sesame oil
• 75 ml sherry vinegar
• 65 gr somerset goats cheese
• 38 gr caster sugar
• 30 ml wine vinegar (red)
• 28 gr butter