A few decades ago when a was a wee child living on a hay farm with a huge family garden we once had a slug problem. Dad put beer in cupped iceberg lettuce leafs and set them in the garden. In the evening we went out and picked up the slug covered lettuce leaves and put them in a bucket, only took a few nights of this to have no more problem. I'm not sure what he did with the bucket full of slugs... knowing my dad he torched them! It may be easier than individual cutting of slugs!