Cut the salmon into bite sized pieces and place in a food processor.
Add the herbs, lemon, garlic powder, egg, flour, salt and pepper and pulse until you have a well combined mix. Don't over blend it, chop until it's JUST mixed.
Add the peas and stir (by hand, not blending) in enough milk until you have a thick batter.
Pour the oil in to a frying pan and heat.
Spoon the burger mix in to four evenly sized patties in the pan.
Cook for about 8-10 minutes on each side, until golden brown and cooked through.
Meanwhile, make the tzatziki by mixing all the ingredients together.
When the burgers are cooked, serve in buns with the lettuce and tomato, and the tzatziki.
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