Barbell curls, couple sets of 6-8 reps...heavy as shit. Rest-pause a few reps, then 2-3 negative's per set.
I'll also hit high curls on the cable crossover for a set of 12, plus 3-4 negatives.
Every 2-3 workouts I'll hit a set or two of preachers for 6-8 reps, plus 3-4 negatives.
About once a month I'll drop the weight and raise the reps up to 12-15 and drop the rest-pause and negative reps.