the best steak sandwich I've ever made

I had some leftover top sirloin that I cooked in the grill pan last night, and that combined with a good shop at Trader Joe's gave me the brilliant idea... steak sammie.

Re-heat steak (1:30 in micro)
Thinly slice warmed steak
Toast good sliced sourdough bread
Put your favorite condiments on bread (I use mayo and dijon)
lay steak slices on bottom piece. Put a slice of good cheese over steak, melt it on steak/bread 30 sec. in micro
lay slices of heirloom tomato and avocado on melted cheese.
top with baby greens or arugula leaves
smash down top piece of toasted bread, slice sandwich in half. Seriously... good.

Pic of the steak I used: