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Heat the oil in a frying pan, add the nuts and toss for a few secs until lightly toasted. Set aside.
Season the steak strips with plenty of pepper and stir-fry over a high heat for 1-2 mins to brown. Set aside with the nuts. Tip the broccoli and celery into the pan and stir-fry for 2 mins. Pour the stock over, cover and simmer for 2 mins. Meanwhile, mix the horseradish and fromage frais together.
Return the steak to the pan and toss with the veg, then sprinkle over the nuts and serve with the creamy horseradish. Great with mashed potatoes.