Bananas of equal mass: any loop, any order in the dimensional regularisation parameter

We describe a systematic approach to cast the differential equation for $l$-loop equal mass banana integral into an $\varepsilon$-factorised form. With known boundary value at specific point we obtain systematically term of order $j$ in expansion dimensional regularisation parameter $\varepsilon$ any loop $l$. The is based on properties Calabi-Yau operators, and particular self-duality.