For the salad, dice the avocados and slice the cucumbers and red onion.
Toss them together in a mixing bowl with olive oil, lemon juice, salt, and pepper.
Sprinkle fresh cilantro on top and set aside.
For the panna cotta, dissolve gelatin in cold water and set aside.
In a saucepan, heat the heavy cream, brewed coffee, and sugar over medium heat.
Once hot, whisk in the gelatin mixture until fully dissolved.
Pour the mixture into ramekins and refrigerate for at least 3 hours, or until set.
Serve the panna cotta with the salad on the side.