Roast snow in a furnace verb phrase
Try to do something impossible and ridiculous
The wardrobe is so heavy. You can't move it by yourself. You might roast snow in a furnace.
You couldn't run after the car to catch the robber. That's like roasting snow in a furnace.
Adequate measures or actions
To attempt to do something but produce no result or effect
No value, use, or purpose
To do one's best or try one's best to do something
The verb "roast" should be conjugated according to its tense.
If someone has a cast iron stomach, they have a strong stomach that can digest unusual food and even bad food without being ill.
Jimmy must have a cast-iron stomach, when he drank milk with lime juice and felt perfectly fine afterward.