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Put the potatoes in a pan of cold water with a little salt. Bring to the boil, cook for 3-4 mins until nearly tender, then drain and set aside.
Meanwhile, heat 1/2 tbsp oil in a large, non-stick frying pan. Cook the onion for 8-10 mins over a low heat until soft. Add the potatoes and sausagemeat, turn the heat up to medium and brown everything for 5-6 mins. Scatter the kale over and wilt for 2 mins, then stir in the sage.
Pour in the remaining oil and push the hash to one side of the pan to make room for the eggs. Crack the eggs in and fry to your liking. Divide the hash between two bowls and top with a fried egg.