A dirty blast is a drink used in the first subquest of Recipe for Disaster. It is made by adding ashes to a player made fruit blast, requiring 10 Cooking. The fruit blast obtained from The Dig Site quest can also be used - however, its pre-made counterpart obtained from Blurberry Bar will NOT work to make it. Additionally, you cannot add the ashes until after the quest begins. Creating a dirty blast gives 5 Cooking experience.
It is needed along with a Rotten tomato, an Eye of newt, and a Greenman's ale for the Recipe for Disaster quest as part of a powerful food-magic (as explained by the Gypsy) wherein the Lumbridge cook inadvertently revives the Culinaromancer.
- When mixing a dirty blast, the player will say "This looks disgusting, but it's what the cook asked for."
- The dirty blast, despite having a drink option, cannot be drunk nor emptied and is useless after the quest.