[Grammar] How do you explain, “I want to eat TAKOYAKI”

たこやきを　たべたいです(watashi wa takoyaki o tabetai desu) or you also say たこやきが　たべたいです。(takoyaki ga tabetai desu)You can use both, however the meaning is slightly deferent. “___　o tabe tai desu” is you show your statement but using particle “____ ga tabetai desu” shows your desire. You really need it now!!

「くるまが　かいたいです(kuruma ga kaitai desu),つめたいコーヒーが　のみたいです(tsumetai koohee ga nomi tai desu)」etc.「日本に　いきたいです」that does not apply the particle [ga]&[o].