Put the maple syrup and mint in a bowl large enough to hold all the ingredients. Zest the lime and squeeze the juice into the bowl. If you don't have a lime about a tablespoon and a half of bottled lime juice should be fine. Add salt and whisk.
½ tablespoon maple syrup, ¼ teaspoon dried mint, 1 lime, 1 healthy pinch of salt
Add the avocado and cucumber to the bowl. Toss to coat everything.