It is good instructional technique to start off by undertaking single engine go-around training at a safe initial height in a training area. Use 1000 feet above ground level as a simulated airfield level. A series of go-arounds can be practiced at various altitudes, to include demonstrations by the instructor. Repeat until the student is competent.
Which is precisely what a certain chain smoking Instructor made me (and others) do in his Seneca 1 all those years ago, when doing CPL and MEIFR training.
But he also had one hard and fast rule re assymetric go arounds;
Once you had gear and full flap down, you were committed to land.
A go around from that point was forbidden!
Some may disagree.
