Trim the stalks and leaves off the kohlrabi (save them for later). Peel the kohlrabi. Chop them into chunks. Pop in a food processor. Pulse till you have fine 'rice'. No processor? Coarsely grate them.
Pop the kohlrabi rice in a heatproof bowl. Fill the kettle and boil it. Add enough hot water to the bowl to cover the rice. Set to one side.
Trim and thickly slice the spring onions and celery. Snap the woody ends off the asparagus spears. Trim them into 3 cm lengths. Peel and grate the ginger. Finely slice the kohlrabi stalks and leaves.
Thinly slice the venison minute steaks - aim for pieces that are 1/4 cm thick.
Warm 2 tsp olive oil in a deep frying pan or wok. Add the venison. Stir fry for 3-4 mins till the steak strips are browned. Lift the venison out of the pan. Pop on a plate.
Add the spring onions, asparagus, celery and kohlrabi stalks to the pan. Stir fry for 5 mins till the veg has just lost some of it's bite and is warmed through. Stir in the ginger.
Add the venison back into the pan with any juices from the plate. Add the kohlrabi leaves. Measure out 1 tbsp brown rice wine vinegar and 1 tbsp tamari. Add to the pan.
Stir fry the venison and veg together for 2-3 mins to heat everything through. Drain the kohlrabi rice. Serve the rice with the venison stir-fry.