1. I keep the chili seeds in, but your mileage may vary, so adjust the heat accordingly. More seeds = more heat. Keep in mind, however, that the heat is the strongest the day you make the sauce and starts to dissipate gradually. This sauce keeps for a long time, and after a couple of weeks, you can’t even taste the pepper. 2. If you want to make a large batch of this sauce (more than half a gallon) — and you certainly should since this sauce lasts a long time — the best thickener to use is pre-gelatinized or “pre-gel” starch which is both acid- and heat-stable (corn or potato starch is not). It’s marketed under the brand name Clearjel®. Your chilli sauce will remain viscous and maintain the nice suspension for the entire duration of its shelf life when thickened with pre-gelatinized starch. Traditionally, Thai sweet chilli sauce is not thickened with starch; the syrupy consistency is achieved through cooking the sauce containing lots of sugar down until it’s thick enough to create a good suspension of the garlic-pepper bits. However, if you notice, bottled Thai sweet chilli sauce normally contained a starch thickener. You can go either way. I personally prefer the version that contains less sugar which is this one.