The latest brew (mellow lemon) had lemongrass added during the steep and boil, but that samples over the last 3 days didn't have any real of lemon. So decided to experiment:
Added 50ml of fresh lemon juice along with 350ml of water and 80g of sugar to make the priming solution. While sterilising the priming solution (by boiling) some zest was also added in a sieve.
This brew was lightly hopped (40 IBU)

- 3 litres of the brew went into bottles
- the rest went into the keg along with "Hop Monster".

"10.6L of Mellow Lemon" + "7.5L of Hop Monster" = 18L of "Bitter Top"

Also put more effort into bottle labels.