For the tomato sauce
1 small onion, chopped
1 tbsp olive oil
1 tin chopped tomatoes
1 tbsp chopped fresh rosemary
1 tbsp balsamic vinegar
1 tbsp caster sugar
salt and pepper
grated Parmesan and salad leaves to serve
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For the pesto
100g fresh basil leaves
85g pine nuts
85g freshly grated Parmesan
1 tbsp olive oil
4 boneless skinless chicken breasts
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