Hirol's Lava Burst is a favored gift in Dragon Age: Origins - Awakening. It gives +10 approval (with diminishing returns) to Oghren, and +5 approval (with diminishing returns) for any other companion.
Located in a chest in Knotwood Hills. As you enter Knotwood Hills, go right down the stairs and turn immediately left; under the stairs is the chest containing Hirol's Lava Burst.
The description of this particular gift might be a reference to The Simpsons character Ralph Wiggum who, after consuming poisoned berries, said "It tastes like burning."
See also EditGifts
Gifts can be sold to a merchant or given to certain party members to influence their approval rating.