Wash the cauliflower and divide into florets.
Bring a pan of salted water to the boil, add the lemon juice and cauliflower.
Simmer for 10-12 minutes until the cauliflower is tender.
Remove the cauliflower from the water with a slotted spoon, drain briefly and place in a pre-heated bowl or plate.
Meanwhile, melt the butter and fry the breadcrumbs, stirring, until golden brown. Scatter the breadcrumbs over the cauliflower and serve.