Once you've completed the FORGE OF DESTINY CHALLENGE TOMB and unlocked the Grenadier Skill, Lara will be able to craft and fire grenades. Equip the rifle (keyboard 3 or D-Pad Right).
Then without aiming, hold the Alternate Fire button (Middle Mouse/R1/RB). Lara combines black powder, salvage, and fat from inventory to make a grenade.
To use it, aim with the rifle...
...and press Alt Fire (Middle Mouse/R1/RB).
Boom!
P.S. If you blow up the little, blue frog sitting on the bank here, we are no longer friends. :(
[Mission Walkthrough| Kuwaq Yaku Walkthrough]
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