Write steps as lines. Their results flow from left to right.
Start on the left. Each tall action groups the rows inside its green outline; keep moving right to reach the finished step.
BUTTER: 4 oz butter
melt BUTTER
SUGAR: 1 cup sugar
BATTER: mix BUTTER SUGAR
Shortcut: melt BUTTER has one input and no new name, so later BUTTER means the melted result.
BUTTER