Mix together butter, oil & 1 1/4c sugar
Add egg yolks, one at a time
Meanwhile, mix egg whites and salt until stiff, add tartar, add remaining sugar, 1 tblsp at a time until VERY stiff
Combine rosemary & 2 tblsp sugar
Fold egg whites into remaining flour into butter mixture
Fold in zest
Turn into pan/s, then sprinkle with mixture of rosemary and sugar
After one hour, drizzle 1 tblsp olive oil over the top of the loaf