Well, First things first, This is my first critique. 1st panel. Perfect. shading is very nice. I could clearly see where the light was coming from. although, How come pinkie's bowl seems to have something spilled on it. 2nd panel. The way you showed how spike threw the wasabi seems too thick. 4rth panel. Where's spikes crest? 5th panel. Spike seems to be standing at the edge of the table. But in the 1st panel he was standing next to twilight and pinkie pie. 7th panel. Absoulutly halairious! It's just that I feel that celestia's hair seems to be above her head a little too high.
Yes it's funny. Spike's face in the third panel is great. But nor quite perfect like you would screw your face up and spazz out. Oh and pinkiepie was great. Just the sort of crule funny thing she would do. Shading was nice, art style is quite nice. The choice of sushi was mediocre I guess and who knew ponies liked sushi? That's a new one. Spikes reaction accept the fact that he burped. It would have been funnier if he just sort of went "blarg" but I don't know really. Also Celestias face at the end sums up perfectly how she would react to this.
It's wasabi, a traditional Japanese paste made from a plant of the same name. It is not generally eaten for its flavor, but for the sensation.When eaten, it has a sensation similar to that of horseradish, stimulating the nasal cavities and sinuses, but is much stronger. I, personally, love wasabi. It's by far my favorite condiment. And yes, it is a condiment.