I got this recipe out of a magazine for a "Vegetarian feta club burger (with coriander-avocado pesto, slow dried tomatoes & olive mayonnaise)" some time ago. I think it looks very promising (although a bit involved!), but I haven't actually tried it yet. If you're tempted to try it perhaps you'd report back if it's any good!
Burger
-: Ingredients :-
1 chopped onion
120g crumbled feta
1 tbsp chopped mint (fresh)
125g breadcrumbs
3 tbsps gram (chickpea) flour
1 large egg
Salt & pepper
Oil (vegetable or sunflower) for frying
-: Method :-
Mix the onion, feta, mint, breadcrumbs & gram flour in a bowl.
Add the egg, season with salt & pepper, mix well and chill for 30 mins.
Shape into approx. 8 flattish burgers.
Heat the oil and fry the burgers gently for 3 to 4 mins each side.
Coriander Avocado Pesto
-: Ingredients :-
100g fresh coriander leaves
1 crushed garlic clove
Flesh of 1 avocado
2 tbsps parmesan
2 tbsps lightly roasted pine nuts
100ml good quality olive oil
-: Method :-
Pop everything except the oil into a blender and whizz until fairly smooth.
Stir the olive oil in slowly to make a thick sauce.
Slow Dried Tomatoes
-: Ingredients :-
8 halved ripe plum tomatoes
1 crushed garlic clove
1 tbsp fresh thyme
1/2 tsp sugar
Coarse salt & ground pepper
60ml olive oil
-: Method :-
Heat the oven to 200C (*) while you mix the garlic, thyme, sugar, salt & pepper.
Place the tomatoes on a baking tray and rub the mixture over the cut sides.
Drizzle the oil on the tomatoes and place in the oven until very soft and dried.
Olive Mayonnaise
-: Ingredients :-
3 egg yolks
1 tsp Dijon mustard
1 tsp white wine vinegar
Salt & pepper
250ml vegetable oil
2 tsps lemon juice (**)
2 tbsps finely chopped black olives
1 tsp chopped capers
1 small crushed garlic clove
-: Method :-
Put the egg yolks, mustard, white wine vinegar and salt & pepper into a bowl.
Slowly whisk in the oil (you need to pour it in a slow steady stream).
Keep whisking until the mayonnaise is thickened.
Add the lemon juice, then the chopped olives, capers and crushed garlic.
To serve :-
12 slices sourdough bread (thinly cut)
Iceberg lettuce
50g rocket
Slow dried tomatoes
2 sliced hardboiled eggs
Olive mayonnaise
Coriander avocado pesto
To assemble :-
Spread 4 slices of the sourdough with plenty of olive mayonnaise.
Top each with the leaves and then a burger.
Then top with tomatoes, sliced egg, then a generous amount of the pesto.
Top with another slice of bread and repeat the layers again.
Put another slice of bread and push down firmly to hold the club burger together.
This is one burger you won't be able to pick up in your hands to eat!
(*) 200C seems a bit high to me, I think the tomatoes might burn, the recipe doesn't state how long they should be in the oven for.
(**) I think I would probably use lime juice rather than lemon.