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Wash and pat dry the beans.
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Divide into 4 batches.
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Heat the canola oil in a deep pan. Once the oil is hot, fry the beans, one batch at a time. Don't over-crowd the pan.
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Cook until they are golden brown.
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Transfer to a paper towel and sprinkle with salt.
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Reserve the oil for other use, leaving about 1 tablespoon in the pan. The beans should still be crisp at this point, not mushy.
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Trim the ends of the beans after frying them if you like.
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In the same pan, re-heat the oil. Once it's hot, add the garlic.
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Cook until fragrant.
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Add the green beans, black bean and chili garlic sauce, sugar and soy sauce. Stir-fry for about 3 minutes.
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Sprinkle with black pepper.
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Finish with a drizzle of sesame oil if you like.
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Serve immediately.