Start your own line from any of Rosa's 4 versions. Their recipe becomes your v1; what you do from there is yours, and their name stays on it. Reading needs no account; making it yours does.
Butter, g a bottle30 → 60 across 3 cooks60g a bottleat v4
v4 · 4 Oct — A dash of orange bitters
The changes in v4
A dash of orange bitters
Close to the best
v4 · 4 Oct · against v3
Close to their best. Worth keeping.
What v4 taught
“That's the one.”
So far
Four versions since August 2026. The best yet is v3. Last cooked 8 days ago.
The recipe
As it stands, at v4
v1v2v3v4
Ingredients
brown butter-washed bourbon
maple syrup
angostura bitterschanged once, last at v4
orange bitterschanged once, last at v4
In the glass
Strength
27.7% abv
a Manhattan: 24.8
Sugar
5.6g / 100 ml
a Manhattan: 3.4
Acid
0.00%
a Manhattan: 0.11
The ice adds about 45% water — 70 ml in, about 102 ml in the glass, from 40.1% to 27.7%.
Beside a Manhattan: 60ml rye whiskey · 30ml sweet vermouth · 2 dashes angostura bitters, made the same way.
What's been moving
Both halves have moved: the dashes angostura bitters most among the ingredients, and steps 1 and 3 in the method.
Never touched: 60ml brown butter-washed bourbon · 7.5ml maple syrup
Method
01
Wash the bourbon: 60g butter browned until it smells of hazelnut, poured warm into a 700ml bottle; 4 hours, then freeze overnight and lift the butter off
4 h60ml brown butter-washed bourbon
02
Stir everything with ice for 20 seconds
20 s
03
Strain over a large cube and express an orange peel over the top
1 dash orange bitters
How it runs
The method in time — what needs hands, and what can happen at once.
4h 06on the table
Every step waits for the one before, as written. 6 min of it needs your hands.