Mackerel or sardines with pickled grapes & boobialla - VFA

Ingredients

• 1kg fresh mackerel or sardines, filleted
• sea salt
• a bunch of fresh dill
• 100ml white vinegar
• 10 boobialla berries
• 1 tsp mustard seeds
• 1 tsp sugar
• 1 tsp black peppercorns
• handful of grapes
• 1 cucumber
• 1 onion, diced
• 1 apple, diced
• 1 garlic clove, grated
• 1 green chilli, minced
• 1 tsp wild fennel seeds
• olive oil
• 100g natural yoghurt