4 × any Gold Nugget + 4 × Flint and Steel + any Redstone Dust → Mob Masher Upgrade Fire
No recipe of Mob Grinding Utils 1.1.10+mc1.21.1 uses Mob Masher Upgrade Fire.
Textures, models and item names © vadis365, flanks255 and the Mob Grinding Utils contributors.
Recipes, names and numbers are read from the mod files of Mob Grinding Utils 1.1.10+mc1.21.1 for Minecraft 1.21.1 (NeoForge). Not affiliated with the mod authors, Mojang or Microsoft.