There is two big ways to get food fast in minecraft. One way is a mob spawner to spawn pigs or find animals to kill to eat. Second way is that you can grow wheat or vegetables. Wheat grows fast and if you put three on the bottom side by side, you make bread. or you can grow melons, sugar can is good but you can't eat it but turn it into sugar so you can a make a cake.
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Yes it is actually the fastest way to get flint from gravel. There is a small chance to actually get flint from gravel ether way.
Long grass.
the same way you do on pc... hold right click while holding the food in your hand.
one of my favourate way is to dig a 2x2 hole down to bedrock but make sure you dont take anything to valubale as you can fall in to lava quickly.
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