Mediterranean fish with garlic crostini

Name: Mediterranean fish with garlic crostini
Prep time: 15 min
Cook time: 40 min
Total time: 40 min
Yield: 4 portions
Ingredients: 4 white fish fillets; sea salt; ½ red onion; 2 tbsp red wine vinegar; 2 tsp caster sugar; 2 sprigs fresh parsley; 2 garlic cloves; 100 g unsalted butter; ½ tsp dried fennel seeds; 150 g brown onion; 2 anchovies in oil; 20 g extra virgin olive oil; 100 g white wine; 1 tsp ground paprika; 1 canned cherry tomatoes; 16 pitted Kalamata olives; 20 g pickled capers; 100 g water; 200 g Danish feta; 8 slices ciabatta bread; fresh dill