Make the filling: Combine the lemon juice, honey, and cinnamon in a medium-sized bowl. Add the fruit and toss it all together.
Make the topping: In a separate bowl, mix the oats, flour, and sugar together. Add the butter and cut it into the dry ingredients.
Pour the fruit into a 1 1/2 quart baking dish. Spread the oatmeal topping over the top in an even layer. Place the baking dish on a baking sheet lined with foil (this will protect your oven in case the juices bubble over). Bake the crisp for 40-45 minutes or until the top is golden and the filling is bubbling hot.