Sweet southern apricot kernels mixed with a small share of bitter northern ones, as Hong Kong herb shops sell them. Cantonese cooks add a small handful to slow-cooked soups; bitter kernels are toxic in quantity.
Southern (sweet) and northern (bitter) apricot kernels used together in Cantonese slow-simmered soups (煲汤) and pear desserts. Traditional Chinese medicine considers the pairing good for coughs and the lungs.