Beat a defender through his legs. Invite him to plant his feet, slip the ball through the gap, and accelerate around him to collect it on the far side.
The player drives at a defender, waits for the feet to split, pushes the ball through the gap, and runs around to collect it. Emphasise reading the defender's feet, disguising the intention, only going when the gap is there, and exploding around to reunite with the ball. Practise both sides. Rotate the roles.
The nutmeg has a reputation as showboating, which undersells it. It is a legitimate solution to a specific problem: a defender who has planted square with his feet apart has closed the outside lanes and opened the one straight through him. Reading that picture is a real skill, and it is the part worth coaching.
The move is decided before it is executed. A defender jockeying properly, side on with feet staggered, has no gap and cannot be nutmegged, and a player who attempts it anyway simply passes the ball to him. A defender who squares up to make a tackle, or plants to change direction, gives you a window that lasts about as long as his weight stays even. The instruction is not learn the nutmeg, it is learn to see the gap.
Inviting the plant is the advanced version. A slight slow-down, or a touch that looks like it is about to be taken past him on one side, brings a defender square and gets him to set his feet. That is the difference between waiting for the gap and creating it.
Weight of touch is where it usually fails. Too soft and it catches a shin. Too hard and it is through his legs but also thirty yards up the pitch with a defender between you and it. Firm enough to clear him, soft enough to reach first, and then get round him immediately. The most common sight in youth football is a perfect nutmeg followed by a player watching his own ball run to the opposition.
Save it to your private drills, then change the animation, adjust positions, swap equipment, or drop it into a session block. Or start from a blank pitch and build your own.