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Start with the mustard dressing, it's very easy. COMBINE mustard and white wine vinegar and start whisking. Slowly ADD the sunflower oil, keep on whisking otherwise the vinegar and oil will not combine very well.
SEASON with pepper and salt, that's it! RINSE the mixed greens if needed and get rid of any excess water using a salad spinner. Also RINSE the spring onions, chop them into rings and set aside.
If you're using plain radishes instead of pickled radishes like we did, you have to rinse them too and then CHOP them into quarters.
DIVIDE the mixed greens and radishes over 2 plates. PLACE the roast beef slices on top, finish it off with chopped spring onions and mustard dressing.
Serve with slices of any bread of your choice and enjoy!