Preheat the grill to medium-high heat. Brush the pineapple slices with honey and sprinkle with sea salt. Grill the pineapple slices for 8-10 minutes per side, or until grill marks appear and the pineapple is golden and tender. Remove from the grill and let cool slightly.
Grill the bread slices for 2-4 minutes per side. Grate the zest from half the lemon and squeeze the juice into a medium bowl. Add the ricotta cheese. Whip until smooth and creamy.
To assemble the bruschetta, spread a generous dollop of the ricotta mixture onto each slice of bread. Top with grilled pineapple slices and sprinkle with chopped mint leaves. Drizzle with additional honey. Serve immediately.