Bring a large pot of water to a very low simmer and add the chicken breasts. Simmer over very low heat for about 15 minutes then remove and rest for 3 minutes.
While the chicken is cooking add the canola oil to a small saucepan over medium heat. Add the onion and cook for about 2 minutes, add the garlic and continue to cook, stirring regularly until the garlic is golden brown. Add the black beans and sugar and cook for a further minute until the black beans are fragrant. Stir through the soy sauce and remove from the heat.
Slice the chicken and spoon over the dressing. Garnish with a few coriander sprigs and serve.
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