Grind sesame seeds past meal stage into a nut butter. Scrape out into a bowl and dribble in the honey. Mix well until you get one sticky mass. For a "chocolate" halvah, mix in raw carob powder - don't mix well; allow it to become marbled. For more vanilla flavor, add 1 tsp of vanilla with the honey.
Line a small (about 4x3 inches) box with waxed paper and press in the mixture. Put in the refrigerator to chill for an hour or so, take out, and slice into cubes.
Don't use cocoa instead of carob, I tried that and it was way too bitter.