I've prepared tri-tip in this way before without cooking it sous-vide and it was perfectly delicious, so if you don't have an immersion circulator, I've included cooking instruction using a large cast-iron skillet instead.
Step 1: Preparing the rub
Simply measure into a bowl, and mix:
1 tsp paprika
1 tsp garlic powder
1 tsp black pepper
1.5 tsp sea salt (I prefer coarse ground, especially if the meat is going to be grilled)
2 tsp ground coffee
I made this amount of rub anticipating using it all to season a tri-tip that was a little under two pounds.