Mix (mix it with something disposable that you will not be eating off later)
1 teaspoon syrup (or honey)
with 2/3 teaspoons borax (put don't use your cooking measurers, just eyeball it. If the ants ignore your bait your tipped them off by putting in too much borax)
Place in a little plastic lid (the lids off things the recycling place won't take anyway), not something you will eat off of later.
Place it near the parade of ants. The ants will swarm to the easy access food but not notice the borax and they will take the unsuspecting food home, feed it to all and poof! There goes the colony.
This should not be ingested by people or animals you want to keep, keep out of reach of children and pets.