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Pop the oil and butter into a saucepan.
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Add the onion and cook until it just begins to carmelise.
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Add the garlic, and again cook on a medium heat until it just begins to turn golden brown.
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Add the rice. Stir until it has absorbed the fat, and just starts to stick to the pan.
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Add the beer. Once it's reduced to almost nothing, start adding the stock, one ladleful at a time.
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Keep going until the rice is al dente.
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Then add the mustard, cheese and stir until both are totally incorporated.
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Serve in a bowl on it's own with a grinding of black pepper, with a crisp salad, or with gently roasted tomatoes.