TheFork users who ate in Leganés have said really good things about Aris, Llave and Basant. Maybe you should give them a try!
Some of the more popular Cellar restaurants where you can go with your friends in Leganés according to TheFork users include:
Aris, with a 8.9 rating
Llave, with a 8.8 rating
Basant, with a 9.3 rating