It's just a person commenting on the fact that the other person can't cook.
Okay, in that case, this sentence is simply a joke. Both スプラッタな and 真っ赤な are adjectives that refer to dreadful blood-soaked objects, so the speaker is making fun of the other person's personality as well as the cooking ability. Doesn't the cook have a personality related to this type of words (e.g., yandere or zombie-maniac)?