pepper-water
/ˈpɛpəˌwɔːtə/noun
1 Biology. A mixture of finely ground black pepper and rainwater or river water, left to stand for a few days so that microscopic organisms in the water grow and multiply and can be observed under the microscope. Now historical.
2A soup flavoured with pepper or other hot spices; specifically = mulligatawny.
Origin
Late 17th century. From pepper + water.