It sounds like one of those futuristic robot heroes of Japanese animation announced in basso profundo voice-over: TAR-A-TOR! In fact, it is the walnut-and-garlic sauce which you will find dressing runner beans in the salad section.
The fresher the walnuts the better, so make your children shell some as a Christmas penance. If using packet walnuts, then open them exclusively for the sauce. After being left to sit and fester in the cupboard for a few weeks your tarator will scare more