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Heat the butter gently in a non-stick frying pan. It will foam, then the solids will separate and begin to brown. This will take 15-20 mins – keep stirring, so that it doesn’t blacken or burn.
While the butter is browning, boil a large pan of salted water. Poach the radishes for 6 mins, then remove with a slotted spoon. Poach the asparagus for 2 mins, remove and put in iced water.
Add the lemon juice to the butter, stir and keep over a very low heat while you add the radishes and drained asparagus. Baste them in the butter for 2 mins.
Remove the vegetables from the browned butter and top with the parsley, plus a squeeze more lemon if you feel it needs it.