In a pan with plenty of water, bring to a boil and add salt. Add the Penne to cook and leave al dente.
In another pan put a drizzle of olive oil, the onion in cubes and the crushed garlic to brown. Add the shimeji and let it cook well. Put the salt and seasonings and mix.
Then the cherry tomatoes and let it cook for 3 minutes and mix. Last put the basil and mix. Serve.