1 mushroom on my burger

It was my very first time at Tiger's Milk and I was so looking forward to it. But was disappointed when I ordered a mushroom burger and there was literally only 1 mushroom on the burger. Seriously, we counted it, one mushroom. Don't do things like that to your customers, it just leaves a bitter taste in a potential loyal customer's mouth. My husband decided not to send his burger back, who is in the mood for a scene when you just want to have a good time with friends? But I was looking forward to this mushroom burger. At the end they were nice enough to send the Manager to my table to deliver my burger and said: "Here's your burger, dripping with mushrooms". Not sure if it was sarcastic, as there was no apology. When I could finally join my husband and friends with eating our burgers, the burger was absolutely delicious. Tasted like a 100% pure beef pattie and mushroom sauce was delicious. Unfortunately I don't know whether I will go back.