Tuna Patties

Ingredients

• 750g starchy potatoes, peeled, chopped
• 2/3 cup plain flour
• 425g can tuna in oil, drained, flaked
• 1 lemon, finely grated rind and ¼ cup juice
• 8 caperberries, finely chopped (plus extra caperberries for garnish)
• 2 eggs
• salt and white pepper
• 2 egg yolks
• 2 cups dried or fresh breadcrumbs
• 2/3 cup extra light olive oil
• 2 pieces preserved lemon, pulp removed, skin finely chopped (optional)
• 2 tbsp olive oil
• 1 bunch frisse or baby curly endive, leaves separated
• 1 large avocado, thinly sliced