Open the crafting table
Place 1 chest in the center slot
Place 5 iron ingots in a V shape around the chest
Put 2 iron ingots in the top-left and top-right slots
Put 1 iron ingot in the middle-left slot
Put 1 iron ingot in the middle-right slot
Put 1 iron ingot in the bottom-center slot
Take the hopper from the result slot