If you are going to make the roasted red peppers from scratch, start by making them (full method underneath). If using jarred roasted red peppers skip to step 2.
In a bowl, roughly mash the sardines with a fork.
To the bowl, add the chopped shallot, minced garlic, lemon zest, breadcrumbs, egg, chili flakes, rosemary and oregano and a pinch of salt and pepper.
Mix well until you achieve a uniform sticky mixture.
With clean hands, divide the mixture into six and form the patties. Chill for 30 minutes.
While the patties are chilling, prepare the yogurt sauce by mixing all the ingredients together. Store in the refrigerator.
In a large frying pan, heat up 2 tbsp olive oil. Cook each sardine patty for 2 minutes on each side, until they get a nice golden brown colour. Place on a tissue paper lined plate so that any excess oil is absorbed.
Toast the buns lightly until they are golden brown.
Spread some yogurt sauce on the top bun.
Start building your burger by layering some lettuce on the bottom bun, sardine patty on top and finally the roasted red peppers. Close with the top bun.
Serve hot as an appetizer or a meal with some sides!