Combine the vinegar, tamari, honey, sesame oil, chili garlic sauce, and ginger in a small saucepan and bring to a boil over medium heat. Reduce heat and allow to simmer, uncovered, for 6-8 minutes, stirring occasionally, until thickened.
Place the chicken thighs in an ovenproof skillet or baking dish just large enough to hold the chicken in an even layer. Pour about 2/3 of the sauce over the chicken, turning each piece of chicken to coat well with the sauce. Position the thighs skin side down and cook for 30 minutes. Turn the thighs over, pour on the rest of the sauce, and cook for another 10-15 minutes or until the chicken is browned and cooked through. Allow to rest 5 minutes before serving with the spring vegetable cauliflower rice.
Spring Vegetable Cauliflower Rice:
Cook the cauliflower rice according to the package directions.
Heat the oil in a large skillet over medium-high heat. Add the leek and carrots and cook, stirring, for 2 minutes. Add the asparagus and peas and cook for another minute. Add the cauliflower rice and cook, stirring, for another minute or two. Add the salt, pepper, tamari, sesame oil, and lemon juice and cook, stirring just until everything is heated through and thoroughly mixed, about 1 minute. Serve with the chicken.
Notes
If you are making cauliflower rice from a head of cauliflower, simply grate the raw cauliflower with a box grater or pulse in a food processor until it resembles rice. Transfer to a microwave-safe bowl, cover with plastic wrap, and microwave on high for 4 minutes.