intensely

In an intense manner.

He pursued his studies intensely.

To an intense degree, extremely.

An intensely private man, he kept chit-chat to a minimum.

You could just use ordinary shop-bought kecap manis to marinade the meat, but making your own is easy, has a far more elegant fragrance and is, above all, such a great brag! Flavouring kecap manis is an intensely personal thing, so try this version now and next time cook the sauce down with crushed, split lemongrass and a shredded lime leaf.