Legend of Kanakadara:

Once, the great sage Shankara, the founder of Advaita philosophy, went knocking at each and every door seeking food. The lady of one of those houses saw this young boy who had come seeking food or 'bhiksha'. She felt deeply drawn by the young boy's powerful countenance. She was so poor that she had nothing to offer to this extraordinary child. She was pained thinking of her misfortune. Shankara could sense her restlessness and told her that anything that she had, however little it be, would suffice. It was 'Dwadasi' or 12th phase of the Moon and she just had a single gooseberry to break the 'Ekadasi' or 11th Moon phase fast.Totally embarrassed, she brought this gooseberry and dropped it into the young boy's begging bowl. Realizing how she felt, Shankara was really moved. He sang a hymn in praise of Goddess of Wealth, Sri Mahalakshmi. Immediately there was a shower of 'golden gooseberries' in the courtyard of her house. The hymn that Shankara sang is the popular 'Kanakadara' chants.
Click here to view the image of Mahalakshmi Maha Yantra.