01 -
Slice the leeks lengthwise, chop them into small rounds, and rinse them thoroughly to clean.
02 -
Melt the butter, toss in the chopped leeks, and cook over a low flame for about 25 minutes, stirring occasionally.
03 -
Mix in the lemon juice, mustard, and cream. Then sprinkle salt and pepper and stir everything together.
04 -
Let it cook gently for an extra 10 minutes on low heat.