In a shaker:

1oz Gin, 1oz Kahlua, 1oz Creme de Cacao, 1oz Lenin Juice, 1 egg

Dry Shake

Shake with ice and strain into a rocksglass, add angostura bitters if desired

Very good, similar to an espresso martini in my opinion, and silky smooth with the egg

Potential improvements would be subbing kahlua for Mr Black and a 0.25oz of Simple and using a black crème de cacao for a nicer colour and likely more prominent coffee taste