My lunch

I am feed quite well at lunch today.main course is a Fried pork shoulder seasoned by cumin.it's so yummy.the surface is crisp and fragrant,inside is very juicy and tender.

I ate well at lunch today.  The main course was fried pork shoulder, seasoned with cumin.  It was so yummy! The outside/skin was crisp and fragrant, the inside was juicy and tender.

My lunch

I ate am feed quite well at lunch today. The main course was fried pork shoulder, seasoned by cumin. It was so yummy! The outside surface was crispy and fragrant, and inside it was very juicy and tender.

Well written, keep practicing =)

my lunch

* am is present tense, you're not eating lunch right now, you've eaten it already so the past tense was should be used here.

* feed is also present tense, and isn't really used when referring to YOU eating food. Fed would be more correct. That sentence even after correcting it (I was fed quite well at lunch today) still doesn't sound quite natural though. A more natural sentence would be something like this:

I had a big lunch today. 

*My or The main course (both work honestly)

*The main course Was fried pork shoulder seasoned with cumin. The main course doesn't exist anymore, because you ate it, so past tense should be used here. The pork shoulder was seasoned with cumin, because the pork in question and the cumin are going together when they're served to you. Pork shoulder being seasoned by cumin is saying that the Pork Shoulder was seasoned by someone named Cumin (Maybe it was, but I would say it wasn't :P)

* The inside was juicy and tender, because we're talking about the pork itself. You could also say 

Inside, it was very juicy and tender

Though that sentence sounds a little weird.

my lunch

I had a great lunch today. My main course was fried pork shoulder seasoned with cumin. It was so yummy. The surface was crisp and fragrant, and the inside was very juicy and tender.