The minipresso does not like to pump if it cannot build pressure, so I stuff the filter basket with paper towels to provide resistance and then follow the directions above as if you were brewing. It is also useful to occasionally follow this process with vinegar (and then a few cycles of water) to descale the pump and nozzle.
https://www.amazon.com/Minipresso-Portable-Espresso-Compatible-Manually/dp/B00VTA9F6U

