Blanch or steam the green peas, then rinse them under cold water. Let them cool.
Meanwhile thinly slice the spring onion, mince the garlic and whisk the egg or make the flax-egg for a vegan version.
Put the peas, oats, spring onion, herbs, garlic, egg ( or flax-egg), lemon zest and a squeeze of lemon juice in a food processor and whizz until you get a coarse mixture. Don’t purée it!
Season with salt and pepper, then transfer the mixture into a bowl and rest it in the fridge for minimum 30 minutes ( ideally 2 hours).
Take the mixture out of the fridge. It should be sticky and a bit soft but holding together - if not, add some breadcrumbs and combine.
Make about 6-8 patties between your palms, then coat them in the breadcrumbs.
Heat some oil in a frying pan or spray the patties with oil.
Fry the patties on each side until golden. (Alternatively, you can bake them for a healthier version.)
Assemble the burgers to your liking - or serve the patties with a dip or salad and perhaps baked sweet potatoes.