Preheat oven to 425F and line a casserole dish or baking dish with sides with parchment paper - you may want to double line.
Peel carrots, trim off the ends, and cut into pieces. Cut each large carrot into 3 pieces on a diagonal and then cut each piece in half longways. Place carrots in the casserole dish.
Place butter, brown sugar, maple syrup, lemon juice and salt into a sauce pan. Heat over medium-low heat until the butter melts and the other ingredients can be whisked into the butter.
Pour the liquid over the carrots and toss to coat them completely.
Place the dish in the oven and bake at 425F for about 40-45 minutes tossing them every 15 minutes. The carrots are done when they are browned in some spots and are soft and cooked through
Remove from the oven and serve warm
Notes
You can use all orange carrots or a mix of multi colored heirloom carrots
To shorten prep time you can use precut baby carrots, these may cook faster so remove from the oven when they are soft enough to easily pierce with a fork