Rinse the potato slices under running water to remove some of the starch. Bring a large pan of lightly salted water up to the boil. Carefully drop on the potato slices, bring back up to the boil and cook for 3-4 minutes until just tender but not falling apart. Drain well.
Heat the oil in a medium sized, preferably non-stick, frying pan and add the garlic, if using. Fry for one minute then tip in the potatoes, stirring to coat well in the oil. Scatter over the Tenderstem, mixing lightly among the potatoes. Tuck in the pieces of ham.
Beat the eggs in a bowl and season well with salt and pepper. Carefully pour into the pan. Allow to set over a medium-low heat for around 8-10 minutes - the frittata should be set about two thirds of the way through.
Preheat an overhead grill to hot. Sprinkle the cheese over the frittata and put under the grill to melt and finish setting the eggs.
Recipe courtesy of Tenderstem Broccoli