Remove tough stalks from the spring greens, then thinly slice the leaves.
Heat the oil in a large frying pan or wok. Fry the greens for 3-4 minutes until starting to wilt. Season well with salt and black pepper.
Meanwhile, trim and slice the spring onions and add to the pan.
Peel and crush the garlic clove and add to the pan. Cook for a further minute or two until the greens are cooked through. Remove from the heat.
Mix the juice of the lemon and olive oil in a small bowl, then pour over the greens. Toss through to coat. Taste and adjust seasoning, then serve immediately.
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Notes
For more soft and tender spring greens (rather than crispy), just place a lid over the frying pan for the last few minutes of cooking time. This will steam them in the pan.