For the venison, cut the loin into medallions about 2cm/¾in thick.
Wrap a piece of bacon around the side of each venison medallion, securing with a cocktail stick.
Heat the oil in a frying pan, add the venison and fry on each side for about 3-4 minutes, or until cooked to your liking. Remove from the pan and leave to rest on a warm plate.
For the blackberry and sloe gin glaze, add the stock to the pan and deglaze, scraping the bottom of the pan with a wooden spoon to incorporate the caramelised meat juices.
Add the blackberries and poach for 2-3 minutes, mashing them lightly with the back of a fork.
Add the sloe gin and bring to the boil, then reduce the heat and simmer for a further 2-3 minutes. Season with salt and freshly ground black pepper.
For the rösti, mix the grated vegetables together and place in a clean tea towel. Roll the towel tightly into a ball and squeeze out all the water from the vegetables.
Break up the ball of vegetables into a bowl and add the melted butter. Season with salt and freshly ground black pepper and stir well to combine.
Press the mixture into a patty about 1cm/½in thick.
Heat the olive oil in a frying pan and add the rösti. Fry for 2-3 minutes on each side until golden-brown and crisp.
For the parsnip crisps, cover the base of a deep sided frying pan with about 3cm/1¼in of vegetable oil. Carefully drop the parsnip slices into the hot oil and fry until golden-brown and cooked through. Drain on kitchen paper.
Bring a pan of water to the boil and cook the the sugar snap peas for two minutes and the green beans for 3-4 minutes. Drain and toss with a drizzle of olive oil, salt and freshly ground black pepper.
Cut the rösti into four pieces and place a piece in the centre of four serving plates. Top each rösti with the venison, a spoonful of sauce and some parsnip crisps. Place the greens alongside and serve immediately.
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James Martin presents a compilation of favourite Saturday Kitchen moments.