Have you ever had this? It's a traditional local dish.

Notes:

• Maybe your friend Jim, from England, is visiting you in your country.
• You are in a restaurant.
• You ask him: 'Have you ever had this?' This is the present perfect tense.
• The structure is have + subject + ever + past participle. (have / had / had - an irregular verb.)
• Ever means at any time (in your life.)
• Had means eaten. (Eat / ate / eaten - another irregular verb.)
• You are asking if Jim has eaten, at any time in his life, this (sushi, for example.)
• Traditional local dish. This is food made to a particular recipe and which is typical of a particular country or area.
• For example, Paella is a traditional Spanish dish.

This sentence is an example of food, present perfect tense, restaurants.